The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Sound at the right vibration can bore holes through a solid object.
134
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Aluminum used to be more valuable than gold!
84
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The force of a suction cup is calculated using F=AP.
15