The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
Iron weighs more after it rusts.
16
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
One ragweed plant can release as many as one billion grains of pollen!
51
