Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Diamonds can be shattered with a hammer.
-104
A cubic yard of air weighs about 2 pounds at sea level.
31
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The average home creates more pollution than does the average car.
33
