Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Balsa wood is classified as a hard wood!
41
Sound travels about 4 times faster in water than in air.
408
Cold water weighs more than hot water.
93
Nylon is made from coal and petroleum.
42
Sound travels fifteen times faster through steel than through air.
134
The only letter not appearing on the Periodic Table is the letter "J".
180
One 75-watt bulb gives more light than three 25-watt bulbs.
57