What is dark matter? How fast could a T. rex run? How did Mary Queen of Scots keep her dying wishes secret from her enemies? Scientists and historians have discovered a lot about our past, our future and how the world works, but SO MUCH remains unknown. This exciting information book filled with 100 fascinating and mind-blowing facts explores the edges of human knowledge and the vast world of science just waiting to be uncovered. With eleven books to explore in this best-selling and award-winning series, there are over 1,100 facts to discover. Packed with bold, graphic illustrations and clear text, the series is perfect for dipping in and out of, and for sharing with family and friends. Usborne Author: Martin, Jerome Subtitle: A fact book for kids Series: 100 THINGS TO KNOW ABOUT Lower age: 8