"The first one is an organic compound. It’s collagen and this gives bone it’s flexibility and durability. The opposite end of the scale here is something called calcium phosphate and this is a mineral compound and this gives bone it’s structure and strength. Combining the two makes bone the unique material it is."
UNITED KINGDOM, London : A Tiger butterfly sits on the nose of a child during a photocall in the Natural History Museum’s ‘Sensational
Butterflies’ outdoor butterfly house in London on March 31, 2015. AFP
PHOTO / BEN STANSALL