We looked at this when I began an electronics degree at UCL in 1978.
You can also prove that the eye is just sensitive enough to detect one photon of light, below which threshold no useful information could be conveyed. The approach then was about information gathering rather than the observation that "you'd hear air molecules jostling all the time if your hearing were more sensitive." I forget whether we looked at other senses, but on QI a while back I saw something about the sense of touch and it seems that rubbing your finger gently back and forth over something can detect things 1/1000th the diameter of a human hair - possibly the size of one atom of something. I can't remember the details - you'd have to Google that.
https://www.sciencedaily.com/releases/2 ... 110853.htm
Last edited by Andrew Fryer on Fri Nov 10, 2017 10:40 am, edited 1 time in total.
1975 Calatayud y Gisbert, Yamaha CG131S.