The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Sound travels about 4 times faster in water than in air.
408
A cesium atom in an atomic clock beats over nine billion times a second.
43
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
One barrel of petroleum holds 42 gallons.
20
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5