Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Iron weighs more after it rusts.
16
Sound travels about 4 times faster in water than in air.
408
Scientists aren't sure what color dinosaurs were.
312
Aluminum used to be more valuable than gold!
84
The sun is 330,330 times larger than the earth.
75
