Solar Powered Tetroon Generates Enough Lift to Fly

Quelab has created a balloon shaped as a tetrahedron with transparent top and black bottom which lifts with just solar power. They begun this project "to enable us to know that flight is possible without using either the scarce and non-renewable gas Helium, the possibly-dangerous Hydrogen, or even the fossil-fuel Propane".

As a funny side-note: The Tetroon escaped and got reported as UFO.