693
«See,» National Sleep Foundation, .
694
Mathias Basner, email to the author, March 26, 2015.
695
Jen Christensen, «Warning Labels on Your Light Bulbs,» CNN, June 9, 2015, .
696
Laura Beil, «In Eyes, a Clock Calibrated by Wavelengths of Light,» The New York Times, July 4, 2011, .
697
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