Countdowns

Reference From 9-foot tall ostriches to albatrosses with gargantuan wingspans, here are some of the biggest birds in the world.

Looking to inspire the next generation of curious minds? These are our picks of the best popular science books for children of all ages.

Nebulas — colorful clouds of expanding gas and dust — have long captivated stargazers with their beauty. Here are 28 of the most stunning nebulas in the universe.

Take a look at five of the biggest treasures that pirates have ever plundered.

Mind-boggling beauty abounds in photographs from around the globe submitted to this year's Milky Way Photographer of the Year contest.

Artists and scientists have been creating optical illusions for centuries. Here are 35 mind-bending examples that prove you can't always trust what your eyes are telling you.

All that you've heard about the Vikings may not be true.

Some of the diseases and natural disasters chronicled in the Book of Exodus can be explained by scientific theories.

De-extinction, the science of resurrecting extinct species, is progressing in leaps and bounds. Here are six creatures that researchers could bring back to life — and one they've already revived.

The partial solar eclipse on March 29 wowed skywatchers in the Northern Hemisphere.