ELASTICITY
When wet, a healthy strand of hair can stretch an additional 30% of its original length.
COLOUR
Black is the most common hair color. Red is the rarest and only exists in about 1 percent of the world’s population, with blonde hair found in 2 percent.
MOLECULES
Hair is 50 percent carbon, 21 percent oxygen, 17 percent nitrogen, 6 percent hydrogen, and 5 percent sulphur.
SPLIT ENDS
The scientific term for split ends is “trichoptilosis.”