Diamonds can be shattered with a hammer.
-104
Sound travels about 4 times faster in water than in air.
408
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Pure water (H2O) does not conduct electricity on its own.
46
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The force of a suction cup is calculated using F=AP.
15