Genetic researchers have been working for a long time to reproduce the mysterious evolutionary step that grew legs on fish. This change eventually moved life from water to land, resulting in a explosion of walking species that took over the Earth's land and skies more than 300 million years ago. Read More >>

When Zac Vawter lost his right leg in a motorbike accident, he thought he'd never walk properly again. Now, he's managed to use a bionic limb, hardwired into his nervous system, to climb 103 flights of stairs in the annual SkyRise Chicago skyscraper climbing contest. Read More >>