Jellyfish have been around for over 500 million years. But is sleep that ancient?
Why don’t pandas have more sex?
It’s true. Male pandas have very teensy winkies so minute that over the years many humans trained in the ways of sexing bears have mistaken boy pandas for girl pandas. Female pandas have a reproductive window so fleeting – just
Tian Tian, maybe definitely not
It is now virtually certain that Tian Tian, the female giant panda at Edinburgh Zoo, is no longer pregnant. Following artificial insemination in April, the zoo has been tracking Tian Tian’s hormone levels. The one to watch is progesterone. At