It's often said that blood is thicker than water – that family ties trump all others. But research with groups of men fighting in Libya has suggested that the bonds they formed in times of great adversity were as strong as those they had with their own kin.
This amazing image of a daisy shows the blossom, and a group of dry insects, below the water level. It's a striking image of the power of surface tension.
There are some moments when you think that Don Pettit has lost his damn mind, in the coolest way possible. One of those moments is in this video, in which he turns himself into a floating disembodied head. And he does it, using just some water and the International Space Station.