One ragweed plant can release as many as one billion grains of pollen!
51
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Nylon is made from coal and petroleum.
42
Pumice is the only rock that floats on water.
14
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
Aluminum used to be more valuable than gold!
84
Sound travels about 4 times faster in water than in air.
408
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5