Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Sound travels about 4 times faster in water than in air.
408
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
Nylon is made from coal and petroleum.
42
One third of the electricity produced on earth is used to power electric light bulbs!
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The only letter not appearing on the Periodic Table is the letter "J".
180