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In his research, U.K. Astronomer Royal Martin Rees has tackled topics as varied as the Big Bang, quasars, and more far-out ideas like the search for dark matter and the possible existence of a multiverse. But as you’ll see in this profile, Rees’ interest in science was first sparked by a more down-to-earth question: what drove the high and low tides of the ocean. And while he devotes a lot of time to unspooling the mysteries of the universe, Rees is equally concerned with communicating scientific issues to the public. Check out this amazing man, who works tirelessly to inspire the next generation of scientists.