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?
I have a friend who says there's not much oxygen on earth. Ever since I heard that I can't catch my breath! What's the truth?
Why doesn't the flame just continue to burn underneath the bell, no matter how flat you crush it? The answer is air.
The chair you're sitting on and even the computer you're reading could be considered empty space!
Find out why the world, as we know it, is mostly empty space.
You've probably seen things decay before. How does the process work?
How does temperature affect our world? What does temperature measure? How is temperature related to volume?
Nothing will scratch or damage a diamond, while a diamond can scratch any other material on Earth. So what makes them so tough?
How do scientist fix nano-sized computer problems?
Find out how scientists made a tip so small it only consists of one atom. Now that's sharp!