TIL that cells can communicate with each other even while separated by glass, by sending and receiving photons. User sealclubber, in the Today I Learned (TIL) subreddit, 24 Aug 2012
Paramecium use endogenous photons as information carriers User pjharvey, in the Reddit Science subreddit, 19 May 2009
Cellular Communication Through Light User cryptopookie, in the Cryptogon: News, Analysis, Conspiracies subreddit, 19 May 2009