To give you an example of how tiny 550nm is, if you were 550nm tall, at least four of you could lie down end to end in a coach class airline seat.††

(Nothing the footnote) That cracked me up. You are hilarious.

Also the primitive chemical that absorbs the green is fascinating. It does seem pretty weird... Do you think it's more of a coincidence that the primitive chemical used the green band but was just terribly inefficient at it (I am assuming)? Is there a chemical process that uses the green band efficiently? And if it's possible, how would that compare to the efficiency of our current state of the art solar panels?

You're right though. This was a fascinating topic all on its own. And just recently was in conversation about how color perception works for humans too, which was also fun.