The solutions to today's puzzlesEarlier today I set you these puzzles for English majors, i.e people who studied English at university. Here they are again with solutions and commentary from Ben Orlin, whose book Math for English Majors is out in September.For each question below, which option is bigger? No calculators allowed!the sum of all squares from 1 to 100the sum of all cubes from 100 to 20017% of 3232% of 173997/40014996/5001the square root of 6the cube root of 15the number of seconds in a year,the number of hours in a millennium25 Continue reading...
Acquaint yourself with matters mathematicalUPDATE: Read the solutions hereWith apologies to Gilbert and Sullivan, but I meant the other type of English major: a person who studied English at university.American maths author Ben Orlin has a new book out aimed at this demographic. (More on this below.)the sum of all squares from 1 to 100the sum of all cubes from 100 to 20017% of 3232% of 173997/40014996/5001the square root of 6the cube root of 15the number of seconds in a year,the number of hours in a millennium25 Continue reading...
It can be difficult to resist the urge to divulge that someone has been rattling around your unconscious. But it is worth proceeding with careTalking about your dreams is a bit like describing the inside of your own mouth: intimate, personal but mostly dull. And yet, the urge to tell someone that they had a starring role in your dream is always extremely tempting. At least for me. I seem to become particularly seized by the urge to share my night-time wanderings if I haven't actually seen the person in the sleeve-touching, hair-smelling flesh for a while.I once spent two hours tracking down an email address for someone I went to middle school with (and hadn't seen since we were both about 13), just to tell him he was in my dream. I won't bore you with the details (not a consideration I extended to him), but it involved something to do with a doorway, milk bottles and me collecting signatures. Somehow, the fact that this person sprang into my unconscious, apparently unbidden and uninvited, easily 10 years since we'd last shared oxygen and dust, felt significant. Was he OK? Did it mean something? Had he summoned me? It turned out, he was living in Nottingham, worked for a charity and hadn't thought of me for probably a decade. Continue reading...
Up to 100 meteors an hour will appear to emanate in all directions from their radiant point in Perseus constellationIt is the big one for meteor watchers. The annual Perseid meteor shower will reach its peak of activity on the night of 12 August going into the early hours of 13 August. The chart shows the view looking north-east from London at midnight.The moon will have 50% of its visible surface illuminated, and will be setting near midnight, leaving the sky as dark as possible for seeing the fainter of the meteors. Continue reading...
Pylon design | Wind turbines | Grieving | Summer riots | Former Conservative MPsWhen our children were young, tolighten the boredom of driving on holidays in France, we gave titles to different designs of pylon - such as perky cat" and droopy dog" (Letters, 30 July). Perhaps if we had more variety in pylon design in the UK and gave them quirky names, people might learn to love them as well as appreciating their necessity.
A fuller appreciation of the sounds that surround us can transform your lifeThe philosopher Friedrich Nietzsche wrote that life without music would be a mistake. I agree, but I'd expand the frame to include a wide variety of other human and non-human sounds. For me, the world is often auraculous or ear-marvellous" - full of noises, which, to cite Caliban in Shakespeare's The Tempest, give delight and hurt not".Among my earliest memories as a small child is the sound, on a summer evening, of a peal of church bells echoing off the hillsides around the village in Hampshire where my grandparents lived. Over the years since then I have been intrigued by sounds of almost every kind - though I do exclude a few, such as some of those in the genre of music known as noise", which a friend says he finds soothing, but which I find about as welcome as putting my head in a buzzsaw. Continue reading...
Technical issues and poor comms led many to believe two astronauts are lost in space, but a return date is imminentIt should have been a welcome public relations triumph for Boeing, an opportunity to show that even if panels were falling from its aircraft, it could still fly humans into space and return them safely to Earth.And for a while at least, it looked like it had been successful. The majestic June launch of the much-delayed and over-budget Starliner capsule from Florida, ferrying two Nasa astronauts to the International Space Station, offered a glimpse of a bright new future in the heavens for the troubled aerospace giant. Continue reading...
Analysis suggests extent of problem UN estimates is causing 500,000 deaths a year in sub-Saharan regionA fifth of medicines in Africa could be substandard or fake, according to a major research project, raising the alarm over a problem that could be contributing to the deaths of countless patients.Researchers from Bahir Dar University in Ethiopia analysed 27 studies in the review and found, of the 7,508 medicine samples included, 1,639 failed at least one quality test and were confirmed to be substandard or falsified. Continue reading...
The 35-nation Iter project has a groundbreaking aim to create clean and limitless energy but it is turning into the most delayed and cost-inflated science project in history'It was a project that promised the sun. Researchers would use the world's most advanced technology to design a machine that could generate atomic fusion, the process that drives the stars - and so create a source of cheap, non-polluting power.That was initially the aim of the International Thermonuclear Experimental Reactor (Iter) which 35 countries - including European states, China, Russia and the US - agreed to build at Saint-Paul-lez-Durance in southern France at a starting cost of $6bn. Work began in 2010, with a commitment that there would be energy-producing reactions by 2020. Continue reading...
The director of the Carl Sagan Center on the possibility of life elsewhere in our solar system, what Venus can teach us about global heating, and what she thinks of Elon MuskThe astrobiologist Nathalie Cabrol was born in 1963 and raised near Paris. She completed a PhD at the Sorbonne on the evolution of water on Mars and moved to the US in 1994 as a researcher at Nasa Ames. She has worked extensively in the Atacama desert and the Chilean Andes, exploring how life adapts to extreme environments analogous to those on other planets. Cabrol, who lives in Northern California, is now the director of the Carl Sagan Center at the Seti [Search for Extraterrestrial Intelligence] Institute. Her latest book, The Secret Life of the Universe: An Astrobiologist's Search for the Origins and Frontiers of Life, is published on 15 August.How did you get interested in the heavens?
UK tax credits to promote research and development were claimed by a pub for changing its menus and by window cleaners for hanging their bucketsA government scheme to champion new research and boost the economy has cost more than 4bn in fraud and error since 2020 after widespread abuse.The research and development tax credits scheme was designed to help drive world-leading innovation, but turned into what has been described by experts as a wild west" with huge volumes of dubious claims. Continue reading...
Protein from flies and larvae is taking off, if more for chicken feed than human lunches. But what's bugging the whole sector is a post-Brexit rules snarl-upCentral London is not known for its farms. Yet under railway arches a five-minute walk from London Bridge station is a farm that breeds livestock in their hundreds of thousands every year. But there are no cows or chickens down on Entocycle's farm; it focuses on an altogether different category of livestock - insects.The business, which was launched in 2016, is now at the forefront of the UK's growing insect farming sector. It sells its patented technology and modular farms across the globe. Continue reading...
Scientists find impact vaporisation responsible for about 70% and a process known as solar wind sputtering 30%The mystery of how the moon's thin atmosphere is produced has been solved, according to scientists studying lunar samples brought back by the Apollo missions.Discovered in the 1960s and 70s, when Nasa sent astronauts to the moon, the lunar atmosphere is far thinner than that of Earth, and was thought to arise from space weathering of the moon's surface. Continue reading...
Dr Lucy Shenton says specialist care is required for patients such as Maeve Boothby-O'Neill, who died aged 27There needs to be properly funded research into people suffering from myalgic encephalomyelitis (ME) and specialist services for patients, a GP who treated a young woman with the condition told her inquest.Dr Lucy Shenton said doctors needed more help to treat patients such as Maeve Boothby-O'Neill, 27, who had the condition, also known as chronic fatigue syndrome, for a decade before she died at home in October 2021. Continue reading...
Parasites in ponds and rivers cause female genital schistosomiasis - easily treated but rarely diagnosed. A health campaign in Kenya aims to change thisAfter a year of debilitating pain, Penina Kitsao discovered what was really wrong with her after a routine screening for something else.The farmer from Kilifi in eastern Kenya had contracted female genital schistosomiasis (FGS) from the small parasitic worms in the pond her family uses for all their water.I couldn't do anything for weeks," says Kitsao, a 33-year-old mother of four. Doctors kept giving me the same pills every time I went to the hospital. They would suppress the symptoms for a few days, and then they would return even worse." Continue reading...
Archaeologists say wide open mouth of woman who died about 3,500 years ago may be caused by rare, immediate form of rigor mortisShe looks uncannily like The Scream painting by Edvard Munch, but just why an ancient Egyptian mummy has such a startling expression has long puzzled researchers. Now they say they may have the answer - suggesting the woman died crying out in agony.The woman is thought to have been buried about 3,500 years ago and was discovered in 1935 in a wooden coffin beneath the tomb of Senmut - an important architect during the reign of the female pharaoh Hatshepsut. Continue reading...
Rare specimens found in China from 514m years ago thought to be remains of proto-molluscFrom colourful, enigmatic octopuses, to oysters with their iridescent pearls, molluscs today are as beautiful as they are diverse. But it seems their ancient relatives may have resembled the love child of a slug and a hedgehog.Soft-bodied creatures are a rarity in the fossil record as their tissues decay rapidly after death. However, researchers say they have found a rare exception in the eastern Yunnan province, in south-western China, in fossils dating to about 514m years ago. Continue reading...
Research shows strong correlation between summer launches and the frequency of the wispy silvery-blue phenomenonNoctilucent clouds are a rare and special sight. Only visible at latitudes between 45 and 80, these shimmering wispy silvery-blue clouds can occasionally be seen high in the sky on a clear summer's night. But in recent decades they have been making more frequent appearances and now a new study reveals that space launches are helping to spawn them.Made up from very thin sheets of ice crystals, noctilucent - night-shining" - clouds only form under special conditions. High up in the dry mesosphere, about 50 miles (80km) above Earth's surface, the clouds need dust particles, moisture and very cold temperatures to form. Explosive volcanic eruptions sometimes produce these ingredients, and meteor showers too. In the 19th century, noctilucent clouds were only seen once every few decades but now they can be seen several times every summer, with July the most likely month. So what's changed? Continue reading...
by Presented by Ian Sample, produced by Madeleine Fin on (#6PN3M)
Humans have always been obsessed with getting old, or rather staying young, and now science is beginning to catch up. Longevity has become a hot topic from university laboratories to Silicon Valley startups. In the second of a special Science Weekly three-part mini-series on ageing, Ian Sample talks to Venki Ramakrishnan, winner of the Nobel prize in chemistry and author of the book Why We Die. Venki outlines the most promising scientific advances in the field of longevity and discusses the more unusual ways that the wealthy are trying to extend their lives, from blood transfusions to cryonicsClips: Dr James Rouse, CBS Sunday Morning, The Vibez Show, ABC Bay AreaTo support the Guardian, order Why We Die from the Guardian Bookshop Continue reading...
Now is the winter of our discontent. Here are six ways you can overcome the seasonal slumpWith short days and colder temperatures, many of us begin to feel the weight of the winter blues. The lack of sunlight can disrupt our circadian rhythms and reduce serotonin levels, leading to feelings of sadness and lethargy. This seasonal slump can diminish our energy levels, dampen our mood and make the winter months feel interminable.For those who haven't experienced feelings like this before, it can be concerning. However, it's important to recognise that these feelings are common and can be managed. By understanding the causes and implementing proactive strategies, we can combat the winter blues and maintain a positive outlook. Continue reading...
Researchers name 14 factors for people to address to hugely' reduce risk of developing conditionAlmost half of dementia cases worldwide could be prevented or delayed, a study has found, as experts named 14 risk factors.The number of people living with dementia globally is forecast to nearly triple to 153 million by 2050, and researchers warn this presents a rapidly growing threat to health and social care systems. Global health and social costs linked to dementia exceed $1tn (780bn) a year, the research shows. Continue reading...
Experts say facility beyond reach of climate breakdown and other terrestrial events is needed to safeguard biodiversityWith thousands of species at risk of extinction, scientists have devised a radical plan: a vault filled with preserved samples of our planet's most important and at-risk creatures located on the moon.An international team of experts says threats from climate change and habitat loss have outpaced our ability to protect species in their natural habitats, necessitating urgent action. A biorepository of preserved cells, and the crucial DNA within them, could be used to enhance genetic diversity in small populations of critically endangered species, or to clone and create new individuals in the worst-case scenario of extinction. Continue reading...
The insects are being looked after in a conservation project that encourages visitors to enjoy their piercing' lightFar out in the Channel, the lights of ships at anchor flickered while the lighthouse at Anvil Point emitted its steadier beam. Late on, a crescent moon shone a coppery orange.But, undoubtedly, the most extraordinary light source to be seen was the vivid green gleam from the glow-worms that inhabit the herb-rich grassland on the cliffs and quarries in this tucked-away corner of southern Britain. Continue reading...
by Tobi Thomas Health and inequalities correspondent on (#6PMDK)
Initial blood test without need for semen analysis could make screening more accessible'A new accessible blood test that can predict male infertility could soon be available for use in GP practices, researchers say.Published in the journal Scientific Reports, the research looked at data from nearly 4,000 men who underwent semen and hormone testing for male infertility from 2011-20. Continue reading...
US researchers say they have uncovered potential link after tracking 130,000 people over four decadesEating processed red meat could be a significant risk factor for dementia, according to a large study that tracked more than 100,000 people over four decades.Processed red meat has previously been shown to increase the risk of cancer, heart disease and type 2 diabetes. Now US researchers say they have uncovered a potential link to dementia. Continue reading...
Liraglutide appears to reduce brain shrinkage in people with early-stage Alzheimer's, a small UK study reportsA weight-loss drug could help slow the loss of brain volume in people with Alzheimer's disease, according to a small study.Liraglutide, which can also be prescribed for diabetes, is typically taken as an injection once a day. Continue reading...
by Presented by Ian Sample, produced by Madeleine Fin on (#6PK7G)
Humans have always been obsessed with getting old, or rather staying young, but now science is beginning to catch up. Longevity has become a hot topic, from university laboratories to Silicon Valley startups. In the first of a Science Weekly three-part miniseries on ageing, Ian Sample speaks to Richard Faragher, a professor of biogerontology at the University of Brighton, to discover what we know about the biological hallmarks of ageing in our bodies -and why we have evolved to have the lifespans we doClips: Diary of a CEO, Huberman Lab, Healthy Long Life, The Economist Continue reading...
Separate study shows poor diet and added sugar also linked to rise in biological ageThe stress of bereavement may accelerate the ageing process, according to researchers who found evidence that losing a loved one early in life had an impact long before people reach middle age.Scientists spotted biological markers of faster ageing in people who had lost a parent, partner, sibling or child, but the signs were absent in others who had not experienced the death of someone close to them. Continue reading...
It's easy to blame your problems on everyone else. It's much more difficult to face your own failings and take agency in your lifeLike billions of other parents around the world, I have a baby who does not like to go to sleep. Which explains why, among other frankly unhinged attempts, I recently found myself standing over her cot, rhythmically alternating between clapping my hands and clicking my fingers while chanting: Moses supposes his toeses are roses, but Moses supposes erroneously."
Science secretary Peter Kyle says national resilience suffered catastrophically' under ToriesThe UK science secretary has warned Britain is desperately exposed" to cyber-threats and the upheaval of another pandemic, claiming that national resilience suffered catastrophically" under the previous government.Deep public spending cuts under the austerity programme diminished the NHS and other local and national services, and hampered pandemic preparedness exercises, Peter Kyle told the Guardian, while too little was done to address rising cybersecurity risks. Continue reading...
Crescent moon will appear with Pleiades star cluster, Jupiter and Mars, and the bright star AldebaranJuly ends with a spectacular grouping of celestial objects in the eastern pre-dawn skies. The waning crescent moon will appear with the Pleiades star cluster, the planets Jupiter and Mars, and the bright star Aldebaran for two consecutive mornings.The chart shows the view looking east from London at 4am BST on 31 July. On this night, the 25-day-old moon will be a thin waning crescent with just 19% of its visible surface illuminated. The night before, the crescent will be larger, and less fragile-looking, but will be more centrally placed, appearing close to Mars. Continue reading...
Best time for viewing shooting stars in UK is expected to be in the hour or two after midnight on TuesdayThe first meteor shower of the summer may peak in the early hours of Tuesday morning with stargazers hoping to see dozens of shooting stars tearing across the night sky every hour.Astronomers have debated the origins of the Delta Aquariids meteor shower, with the sungrazing comet 96P/Machholz regarded as the most likely candidate. The four-mile-wide ball of dust, rock and ice takes a little more than five years to complete an orbit around the sun. Continue reading...
It may sound childish and potentially dangerous, but actually it's a novel way of really getting to know each otherMy friend Sam doesn't waste a single bite of an apple. He crunches through the core, swallows the seeds and doesn't leave anything behind, but the stalk. In this way, he couldn't be more different from our mutual friend Megan, who refuses to eat apples unless they've been sliced. Sam doesn't own an umbrella. Megan changes her bedsheets every week. Neither Sam nor Megan particularly love striking up conversations with strangers. When Sam was a child, he had to be taken home from his very first sleepover because he vomited Turkey Twizzlers on the carpet.These are the kinds of incongruous facts that people know about their loved ones in movies - as Harry famously said to Sally, I love that you get cold when it's 71 degrees out. I love that it takes you an hour and a half to order a sandwich." In real life, we pass the time talking with our friends about their children, co-workers, exes and eccentric family members, but we don't always hear about the meaningless minutiae that makes up their daily lives. This is why I sincerely recommend that everyone starts doing one thing: ranking your friends. Continue reading...
Sustainable and nutritious, fava beans are being hailed by Nadia Mohd-Radzman as vital for the UK's mental healthNadia Mohd-Radzman is a botanist on a mission. The Cambridge University researcher wants the UK to recognise the wonders of a crop that she believes could transform the nation's health. Hence her campaigning - for the broad bean.Vicia faba has a host of special properties, she argues. It is rich in protein, fibre and iron, for example. More importantly, it contains chemicals that are linked to lasting improvements in the moods and emotions in those who consume them, Mohd-Radzman told the Observer. Continue reading...
With the bestselling Other Minds, the philosopher dramatically changed our view of octopuses. Now, concluding his trilogy about the evolution of intelligence, he shows how animal life has shaped the planet itselfPeter Godfrey-Smith is the scuba-diving philosopher who took octopus off the menu for many readers of his bestselling book, Other Minds. It looked at the distinctive intelligence of cephalopods, rescuing this myth-laden eight-limbed creature from its most frequent setting of a seafood salad and recasting it as subaquatic hero of perception and understanding.Following up that literary success with 2020's Metazoa (the word means multicellular animals), Godfrey-Smith is about to publish the final part of his trilogy on the roots of intelligence, Living on Earth: Life, Consciousness and the Making of the Natural World. Continue reading...
Dutch immunologist Jacques Neefjes believes the drug aclarubicin, unavailable in Europe for 20 years, could have helped 100,000 people with a rare blood cancerFor the past decade, the Dutch immunologist Jacques (Sjaak) Neefjes has been on a mission to bring back a cancer drug that hasn't been available in Europe since 2004. I'm still flabbergasted that a compound that could have helped thousands of people was taken off the market," says Neefjes. Why it was removed seems something of a mystery, but as far as he can tell, it was simply a lack of demand.His latest research shows that this drug, aclarubicin, can improve the survival of people with acute myeloid leukemia (AML) much better than other forms of chemotherapy. If it had been available in Europe for the past 20 years, Neefjes estimates that it could have helped 100,000 people. Continue reading...
A new edition of his theories on dreams argues that he used sexuality' to describe any purely pleasureable activityFor a psychiatrist, so the joke goes, any object that crops up within a dream must represent a phallus. But it seems even Sigmund Freud did not really think all our sleeping fantasies are suppressed erotica. It was just a basic misunderstanding of the pioneering psychoanalyst's work, according to an eminent new version of his influential theories.A revised English edition of Freud's key work, The Interpretation of Dreams, by scholar Mark Solms will correct several errors of translation and aim to definitively challenge the common misconception that Freud believed the erotic drive was behind much of human behaviour. Continue reading...
People with head and neck cancers are said to have better outcomes if fusobacterium is found with their cancerScientists have discovered that a common type of mouth bacteria can make certain cancers melt".Researchers at Guy's and St Thomas' and King's College London said they had been brutally surprised" to find that fusobacterium - a type of bacteria commonly found in the mouth - appears to have the ability to kill certain cancers. Continue reading...
Defining nature as separate from people perpetuates troubled relationship with the natural world, say campaignersIt was last year, during a conference at the Eden Project, the botanic garden and conservation centre in Cornwall, that Frieda Gormley first heard the dictionary definition of nature.The businesswoman and environmental activist was answering questions about her plans to appoint a representative of nature to the board of her company, House of Hackney, when a member of the audience read it out. Continue reading...
A 3ft by 2ft rock marked with off-white spots may offer fossilised record of microbes dating back billions of yearsA spotty, vein-filled rock found by a Nasa rover on Mars contains features that suggest it may have hosted microbial life billions of years ago.The arrowhead-shaped rock, named Cheyava Falls, was discovered by Nasa's Perseverance rover on 21 July as it trundled along the northern edge of Neretva Vallis, an ancient river valley carved by water flowing into the red planet's Jezero crater. Continue reading...
by Kat Lay, Global health correspondent, in Munich on (#6PGKC)
Prof Linda-Gail Bekker receives ovation at Aids summit after presenting trial results of miracle' drug lenacapavirWhen the doctor behind the trial of a new HIV prevention drug heard the results, she could not contain her emotions. I literally burst into tears," said Prof Linda-Gail Bekker.I'm 62, I've lived through this epidemic ... I had family members who died of HIV, as did many, many Africans - many people around the world," she said. Continue reading...
We are sending 1m polio vaccines to Gaza but many people will die from preventable health threats unless we can quickly scale up aid delivery, says the WHO director generalThe polio virus was detected in wastewater samples in Gaza last week, an alarming yet unsurprising development given the dismantled state of the territory's health systems after nine relentless months of war.Across Gaza, more than 39,000 people have been killed, 89,000 wounded, and more than 10,000 are estimated to be missing. Most hospitals are no longer able to function. Already, diarrhoeal diseases, respiratory infections and hepatitis A, among others, are raging through Gaza. Nearly everyone in Gaza is facing acute food insecurity and catastrophic hunger. Thousands of children are malnourished, making them even more susceptible to disease. Continue reading...
by Jonti Horner and Tanya Hill for the Conversation on (#6PGEV)
The Southern Delta Aquariids and Alpha Capricornids meteor showers both peak around 31 July - and stargazers should head out of the city for the best views
Science secretary backs five quantum technology hubs in push for UK to transform healthcare and industryBritain's plans to create advanced devices based on the mind-bending physics of the quantum world have received a 100m boost, in a move ministers hope will have a transformative impact on healthcare, transport and national security.Peter Kyle, the science secretary has announced funds to establish five quantum technology hubs across England and Scotland. They will work with industry and government to develop and commercialise devices and ultimately drive a new economy. Continue reading...
Nasa says pair are not stranded but will stay at International Space Station until technical issues have been resolvedTwo Nasa astronauts on Boeing's Starliner capsule will remain at the International Space Station with no official return date yet, Nasa and Boeing officials said on Thursday morning, as engineers continue to examine the technical problems with the spacecraft.Test pilots Butch Wilmore and Sunita Williams first departed for the station roughly seven weeks ago, in early June, on a test mission that was meant to last about a week. But the capsule's undocking was delayed because of faulty thrusters and small helium leaks that raised safety concerns. Continue reading...
Team of two new AI systems score one point short of gold medal in global maths contest for gifted studentsEven though computers were made to do maths faster than any human could manage, the top level of formal mathematics remains an exclusively human domain. But a breakthrough by researchers at Google DeepMind has brought AI systems closer than ever to beating the best human mathematicians at their own game.A pair of new systems, called AlphaProof and AlphaGeometry 2, worked together to tackle questions from the International Mathematical Olympiad, a global maths competition for secondary-school students that has been running since 1959. The Olympiad takes the form of six mind-bogglingly hard questions each year, covering fields including algebra, geometry and number theory. Winning a gold medal places you among the best handful of young mathematicians in the world.Let ABC be a triangle with AB < AC < BC. Let the incentre and incircle of triangle ABC be I and , respectively. Let X be the point on line BC different from C such that the line through X parallel to AC is tangent to . Similarly, let Y be the point on line BC different from B such that the line through Y parallel to AB is tangent to . Let AI intersect the circumcircle of triangle ABC again at P A. Let K and L be the midpoints of AC and AB, respectively.Prove that KIL + YPX = 180.Turbo the snail plays a game on a board with 2024 rows and 2023 columns. There are hidden monsters in 2022 of the cells. Initially, Turbo does not know where any of the monsters are, but he knows that there is exactly one monster in each row except the first row and the last row, and that each column contains at most one monster.Turbo makes a series of attempts to go from the first row to the last row. On each attempt, he chooses to start on any cell in the first row, then repeatedly moves to an adjacent cell sharing a common side. (He is allowed to return to a previously visited cell.) If he reaches a cell with a monster, his attempt ends and he is transported back to the first row to start a new attempt. The monsters do not move, and Turbo remembers whether or not each cell he has visited contains a monster. If he reaches any cell in the last row, his attempt ends and the game is over. Continue reading...
Science | The Guardian