Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
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
Sound travels about 4 times faster in water than in air.
408