100 things to know about the unknown

"A colorful information book filled with 100 fascinating and mind-blowing facts. Scientists and historians have discovered a lot about our past, our future and how the world works, but SO MUCH remains unknown. 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? This exciting book explores the edges of human knowledge and the vast world of science just waiting to be uncovered"--Publisher's description