Most of us take our oxygen-rich atmosphere for granted. Once upon a time, though, Earth's air was very different.
It may sound paradoxical, but warm spells and flurries often go hand in hand.
When looking at a picture of the sun, how could you tell whether or not it's rising or setting?
A baby grabs the string of a single helium balloon and floats right out of its baby carriage. Why can't people really float into the air using helium balloons?
Planning on climbing Mount Everest? You might want to plan to be gasping for air. Learn more on this Moment of Science.
Have you ever laughed so hard that milk came out your nose?
Raindrops batter the front windshield and seem to avoid the back window as long as the car is moving. How is that possible?
If you've ever wondered why blowing on a thin film of soapy water creates bubbles, this is your lucky day.
More often than not, the wind dies down at night after a blustery day. Where does the wind go? Why are nights generally more calm than days?
If you can't name a politician who was also an active scientist, that doesn't mean they haven't been out there.