"Why do racing cyclists crouch low over their handlebars to go faster? Why do you fall back down when you bounce on a trampoline? And why does the refrigerator door close as if it's being pulled by something invisible? The answer is forces. Gravity, friction, gears, pulleys, levers, and magnets are all explored in this title"--Publisher.
Explores topics including, the properties of solids, liquids, and gases, how liquids become solids and how solids become liquids, how the water cycle works, why seawater is salty, and how changing states make recycling possible.
The author describes the science that has led to the conclusion that the Arctic is thawing due to climate change and that this transformation will have global consequences if we fail to address the challenge of a warming earth.
An introduction to string theory, a unifying theory that encompasses gravity and quantum mechanics. Presents the theory's core ideas and concepts in plain English with a minimum of math.
