One ragweed plant can release as many as one billion grains of pollen!
51
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
In zero gravity, a candle's flame is round and blue.
16
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
A ball of glass will bounce higher than a ball made of rubber.
73
The average temperature at 40,000 feet above sea level is -60 F.
56