Indoor pollution is 10 times more toxic than outdoor pollution.
62
According to studies, men change their minds two to three times more often than women.
72
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
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
One ragweed plant can release as many as one billion grains of pollen!
51
The only letter not appearing on the Periodic Table is the letter "J".
180
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101