In my first piece for nbcnews.com, I examine five big unsolved mysteries about the universe.
Dan Falk is an award winning freelance writer and broadcaster specializing in science stories, and was a 2011/12 Knight Science Journalism Fellow at MIT.
St. Martin's Press (USA) / Goose Lane (CAN)
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St. Martin's Press (USA) / McClelland & Stewart (CAN)
Arcade (USA) / Penguin (CAN)
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