610233 external_news 1535033316 1535554485 For decades researchers have been unable to crack Carl Sagan's 'Faint Young Sun Paradox,' or how the planet kept warm with the right mix of atmospheric gases during the Sun's early, dimmer days. Georgia Tech researchers may have found a clue. Jennifer Glass,an assistant professor in the School of Earth and Atmospheric Sciences and her team found that ancient life may have been breathing nitrous oxide -- also known in dentist offices as laughing gas -- long before it began breathing oxygen. Find more coverage at Space Daily, Laboratory Equipment, and UPI.

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