One ragweed plant can release as many as one billion grains of pollen!
51
Pure water (H2O) does not conduct electricity on its own.
46
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
The only letter not appearing on the Periodic Table is the letter "J".
180
One barrel of petroleum holds 42 gallons.
20
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Aluminum used to be more valuable than gold!
84