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Please note: This is a companion version & not the original book. Book Preview: 

#1 We start our journey toward the discovery of time with the phenomenon of gravity. Gravity is what holds us down to Earth. It is why we fall, and why everything else falls. It is not surprising that this question did not occur to anyone for thousands of years after we regarded ourselves as highly civilized.

#2 The first person to investigate the paths traced by falling bodies was the Italian Galileo Galilei, in the 17th century. He found that all falling objects travel along the same sort of curve, which is a parabola.

#3 The law of gravity is a mathematical object that was discovered by Galileo. It is a simple curve that bodies follow when they fall. The relationship between mathematics and reality is far from evident, even in this simple case.

#4 The idea that there are two worlds, a world bound in time and a timeless world, has been around for a very long time. The idea is that mathematical objects exist just as solidly as what we see in nature, except that they are not in our world but in another realm, without time.

Summary of Lee Smolin's Time Reborn

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