In the past, scientists have tested the survivability of sperm from cold-blooded animals like salamanders, fish and birds in space. Now the first tests involving mammalian sperm have been completed, and they suggest that humans could be able to reproduce on the long flight to Mars.
Also, why do we tend to shun and avoid people who are sick? It's all down to the way they smell and look, apparently.
And ground-breaking research reveals how and why flamingoes can stand on one leg.