Iron weighs more after it rusts.
68
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
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
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
Sound travels about 4 times faster in water than in air.
408
Balsa wood is classified as a hard wood!
41
Brass doorknobs automatically disinfect themselves in about 8 hours.
18