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Slightly OT: "The Rods... so sensitive that they can be triggered by single photon"

This sort of thing is why I love HN. Irrespective of the topic, there is always some little gem I find somewhere. I was very sceptical of this claim, so I looked it up. Turns out it is possible:

http://math.ucr.edu/home/baez/physics/Quantum/see_a_photon.h...

http://www.ncbi.nlm.nih.gov/pubmed/10800676

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1281447/?page=1




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