After this successful interspecies birth, scientists believe they may have found a way to repopulate some endangered animal species.

Physicists, experimenting with quantum theory, say they have moved atoms into a paradoxical realm where they can exist in two places at once.

Scientists at UC Berkeley have discovered that penguins conserve energy when they waddle. Find out how they do it.

Read about the world's first interspecies transfer of a frozen embryo. Find out about the experiment's scientific impact.