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12 epic sites to visit if you were a tourist on Mars, where canyons are deeper than the Grand Canyon

The places an NYC exterminator would never live

What ketamine actually does to your brain

Here's what would happen if all the ice on Earth melted overnight

Why we still haven't been able to find aliens

Why stubbing your toe hurts so much

What if you stopped sleeping

Sumo wrestlers eat up to 7,000 calories a day, yet they aren't unhealthy

The Great Barrier Reef is at a critical tipping point and could disappear by 2050

Why the turkey you eat at Thanksgiving isn't what makes you sleepy

What would happen if humans gave birth in space

What would happen if you jumped off the International Space Station

The science of why golf balls have dimples

This incredible animation shows how deep the ocean really is

Why we knock on wood and the origins of other common superstitions

A doctor breaks down what apple cider vinegar actually does to your body

What's inside a camel hump?

Why don't humans have tails?

Why hangovers are the worst

We asked a dermatologist why hair goes gray, and why some experience the shift as early as their 20s

Newly elected Arizona Sen. Mark Kelly and his twin brother took part in a groundbreaking NASA experiment for 4 years. Here's what we learned from it.

What would happen if you never got out of bed

What happens when you sleep in your contacts

Why you're a mosquito magnet

Why riding a roller coaster as tall as the Burj Khalifa could kill you

How viruses like the coronavirus mutate

3 dietitians debunk 18 weight loss myths, from cutting carbs to fad diets

What would happen to you if you never washed your hands

How rattlesnakes tails make a rattling sound

What if the most powerful nuclear bomb exploded in space