[kgwgk]

> they are understandably clustered around the parts of the spectrum in which sol [sun] is most luminous

That would be understandable but it’s not what’s going on: http://hyperphysics.phy-astr.gsu.edu/hbase/Chemical/watabs.h...

[__MatrixMan__]

I didn't know that about water, thanks.

[tim333]

Ah - so I guess that's why snakes have pit sensors for infrared.