Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Sound travels about 4 times faster in water than in air.
408
For every gallon of sea water, you get more than a quarter pound of salt.
45
The inventor of the Super Soaker squirt gun was a NASA Scientist who also helped develop the Stealth Bomber and the Galileo mission to Jupiter.
7
A cubic yard of air weighs about 2 pounds at sea level.
31
The earth is approx. 6,588,000,000,000,000,000 tons.
175
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