A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

Earth is teeming with life, including humans intelligent enough to ask such ... In our latest NOVA Lab, we’ve created a game that invites students to join in the fun, and trains them to use ...

Africa, south of the Sahara, is home to the richest diversity of animal life on the planet ... human control. Why is it so hard to tame the zebra? Survival of the Fittest. Zebra and other African ...