Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Sound at the right vibration can bore holes through a solid object.
134
Sound travels about 4 times faster in water than in air.
408
Scientists in Germany have developed a candy that doesn't cause cavities.
11