THEORY OF RELATIVITY
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Have you seen Christopher Nolan's Interstellar yet? It's generating a lot of discussion both about the story and the science, and as one of the characters explains in the movie, the science focuses around Einstein's theory of relativity. As the author of a new book about that theory, I thought I should weigh in on the movie.
Albert Einstein was a reluctant celebrity, but he recognized that he could use his fame to promote causes to make the world more humane and democratic. Today -- when both science and democracy are under attack by right-wing forces -- Einstein's voice as both a scientist and citizen are sorely missed.
The concept of a time machine typically conjures up images of an implausible plot device used in a few too many science-fiction storylines. But according to Albert Einstein's general theory of relativity, which explains how gravity operates in the universe, real-life time travel isn't just a vague fantasy.