Moreover, even though humans have been upright for millions of years, our feet and back continue to struggle with bipedal posture and cannot easily withstand repeated strain imposed by oversize limbs.

Then back in Spain, they trained a strain of Pseudomonas bacteria to preferentially nibble salt blooms.

A new strain of swine flu shows that the pandemic version has jumped from humans back to pigs, where it's evolving in new and unpredictable ways.