The human body is marvellous – but it doesn’t have a lifetime guarantee

Evolution has made us survivors, but that's not the end of the story - as anyone with a bad back will tell you

Your body is far from perfect. You're the product of millions of years of evolution, but this process doesn't strive towards "perfection". In fact, it doesn't strive towards anything. It just happens: because there are differences between individuals in a species, and some have better chances of surviving and reproducing than others. There's never a goal in mind. All that matters is those chances of survival and reproduction: a game played out in the moment, between organisms and their environment.