In a football game, the objective of the players is to get the ball into the opposing team’s net. They make move after move, adopt one strategy after another, all to bring the ball forward and into the goal. Now could you imagine playing football with no objective? All your favorite players will simply run around this huge green field with a ball, not going anywhere, not achieving anything, b…
John Adams, the second President of the United States, always traveled with a book of English poetry and took comfort and pleasure in reading from it during his many long journeys. When his son John Quincy was a young boy Adams told him, “You will never be alone with a poet in your pocket.” John Quincy Adams became the sixth President of the United States and the author of over 350 poems. …
This book is about light, energy, mass, space, time, and gravity: it is through these concepts that we explain the theory of special relativity and the theory of gravity, known as the theory of general relativity. We will use many thought experiments and show how physicists create and solve models. This method is the one used by Einstein himself. He understood the theory through both physical …