Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Your brain is 80% water.
525
The bark of an older redwood tree is fireproof.
65
Iron weighs more after it rusts.
68
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
