One ragweed plant can release as many as one billion grains of pollen!
51
Research indicates that plants grow healthier when they are stroked.
173
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One cubic foot of gold weighs more than 1,200 pounds!
78
The average temperature at 40,000 feet above sea level is -60 F.
56
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
In zero gravity, a candle's flame is round and blue.
16