Woodpeckers hammer their beaks into trees at the astonishing rate of up to 22 times per second, creating impacts 100 times larger than a human brain can withstand.

The special spongy bone structure of the skull is one of the factors that makes woodpeckers so resistant to the massive deceleration forces at work.

This spongy bone has inspired the design of a lightweight bicycle helmet (designed by Anirudha Surabhi) made out of cardboard. The technology is also used for the protection of black boxes from airplanes and a new generation of shock absorbers.