On May 23, 7:17*pm, Art Unwin wrote:
On May 23, 9:55*am, Cecil Moore wrote:
eyes which evolved to detect photons, not electrons.

Where is that stated in print?

I did a Yahoo search for, "eye detection of photons", and got 705,007
hits. Here's one of them from the Kansas State University Physics
Dept.

http://web.phys.ksu.edu/vqmorig/tuto...0Photons..html

"It has been demonstrated that light-sensitive cells in our eye (rod
cells) are able to detect single photons."
--
73, Cecil, w5dxp.com