Leo Loved Animals

107

Leonardo da Vinci loved animals. He would often buy animals in cages just so he could set them free.

A Candle’s Flame

139

The human eye is so sensitive that if the earth were flat and it was a dark night, a candle’s flame could be seen from 30 miles away.

The Strongest Material Known To Man

331

Graphene is the strongest material known to man. It’s 200 times stronger than steel. It would take an elephant to break a sheet as thin as a piece of paper.