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Why are cells in blood smears undetectable after absorbing moisture?
2 votes

It might be helpful if you are able to post a picture of what you're seeing, however, it sounds like the blood cells are lysing. The water you introduced to the cells through the moisture in your ...

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Can humans ever directly see a few photons at a time? Can a human see a single photon?
8 votes

Technically, we can sense the individual photons. Here is an quote from a cellular biology textbook: "Absorption of a single photon of light induces a conformational change in the rhodopsin molecule, ...

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