It seems GourmetDan believes science can only be done with direct observation using our 5 senses. GourmetDan. virtually everything in science is the result of indirect measurements through various techniques and instruments. I suppose you believe that the speedometer on you car or a cop's radar gun is an inferred measurement based on assumptions. I'd love to see the expression on a cop's face after he pulls you over for speeding and you tell him he's wrong because his measurements are assumptions and inferred facts!
BTW GourmetDan, do you have any comments or thoughts related to tetrachromic vision in most vertebrates except mammals? You know, the actual topic of this thread?
Ooh, good one doc.
Boy, who can argue w/ that.