Theoretical physicist Ronald Mallett poses for a photo as he prepares to pour dry ice into a ring laser in a lab at the University of Connecticut. Mallett says he kept his work on time travel secret for years partly because colleagues might conclude he was a crackpot.
Theoretical physicist Ronald Mallett poses for a photo as he prepares to pour dry ice into a ring laser in a lab at the University of Connecticut. Mallett says he kept his work on time travel secret for years partly because colleagues might conclude he was a crackpot. Scott Eisen Bloomberg
Theoretical physicist Ronald Mallett poses for a photo as he prepares to pour dry ice into a ring laser in a lab at the University of Connecticut. Mallett says he kept his work on time travel secret for years partly because colleagues might conclude he was a crackpot. Scott Eisen Bloomberg

Physicist wants to build time machine to see his dad

April 25, 2015 08:00 PM

UPDATED April 26, 2015 02:00 PM

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