Iron weighs more after it rusts.
68
The average temperature at 40,000 feet above sea level is -60 F.
56
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Out of all the senses, smell is most closely linked to memory.
146
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
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21