false ...to my own surprise.
At best the human eye can only distinguish about 50 scales of gray between black and white: ...why does this link about vision have "fuck you eye" phonetically in the address?
http://faculty-web.at.northwestern.e...eeing%20is.pdf
The typical human ear is sensitive to pressure variations less than one billionth of atmospheric pressure. (ps: my wife must speak quieter than that)