References

Discover interesting facts about Mars, its moons, its atmosphere, and the possibilities of life.

BUYING GUIDE These are the best treadmills you can buy in every category, from NordicTrack x22i and Mobvoi Home Treadmill to Peloton Tread.

Buying Guide Set up your home gym with the best workout equipment for home.

The rich history of ancient Egypt involves power struggles, amazing feats of engineering, advances in writing and art, and more.

Discover interesting facts about ancient Egypt's pyramids, mummies and pharaohs.

Discover interesting facts about the different types of bears and learn why not all bears hibernate.

The best cameras for aspiring photographers who want to take a step up from their smartphones — whether you want to photograph the night sky, wildlife or the world around you.

Discover the history of our feline friends, and learn about the debate over whether cats are really "domesticated" at all.

Discover interesting facts about cat intelligence, how they see the world, and why we keep them around.

Everything you need to know to photograph a meteor shower, from choosing the right time to camera settings, and some advanced techniques for creating meteor images you can be proud of.