Life's Little Mysteries: Science questions, answered

Gum is full of non-food items, like resins, emulsifiers and softeners. So what happens when we swallow a piece?

Earth's day used to be five hours shorter, and it's predicted to continue lengthening over time.

People who sneeze in bright lights, like the sun, may have autosomal dominant compelling helio-ophthalmic outburst syndrome, or ACHOO.

People can stay in comas for weeks, months or even years. But what causes some of these patients to "wake up"?

The coldest city in the world is in Siberia, where temperatures plummet to minus 76 degrees Fahrenheit. Here's why it's so cold there.

The search for alien life is one of humanity's greatest missions, but it may look nothing like anything we've seen on Earth.

While Earth spins in the same direction as the sun, that's not the case for every planet in the solar system.

The ancient Egyptians buried their dead at Saqqara for thousands of years. Why was the necropolis so important to them?

Stars die at different rates depending on how they kick the bucket.

The daytime moon is visible almost every day of the month, except those closest to the full moon and new moon. Here's why the moon and sun often share the daytime sky.