What is space-time? Depending on how fast you're moving or how close you are do Earth's gravity can change the way time feels ...

Learn why our ancient ancestors maintained their climbing abilities once they developed their walking ones, and discover how ...

Hibernation might sound like an extreme way of life: Animals gain a lot of weight quickly, then drastically slow their metabolism to survive off stored energy through long, cold months. But for all ...

What are some of the most oddly-shaped galaxies? Learn more about some of the Universe's unusual formations.

Knowing the current health status of your heart is crucial — and dating your heart’s age might just be the right tool for it.