The article is about seeing a single atom; it's possible to see a single photon too, as was previously discussed on HN: People can sense single photons: Experi

The article is about seeing a single atom; it's possible to see a single photon too, as was previously discussed on HN: People can sense single photons: Experiment suggests that humans are capable of perceiving even the feeblest flash of light [1][2] [1] http://www.nature.com/news/people-can-sense-single-photons-1.20282 http://www.nature.com/news/people-can-sense-single-photons-1... [2] https://news.ycombinator.com/item?id=12163109 https://news.ycombinator.com/item?id=12163109