Sound travels fifteen times faster through steel than through air.
134
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
Iron weighs more after it rusts.
16
Nylon is made from coal and petroleum.
42
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One ragweed plant can release as many as one billion grains of pollen!
51
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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