At first I thought that given how far the blue cones' response curve is from red and green that maybe it was a relatively recent development. But then I realized there's no way it would have become nearly universal in that short a time.
I have a phone that doesn't ring, a line that doesn't sting, a letter never sent... I have a dream where snowflakes fall inside a painted hall... HA! THAT DON'T PAY THE RENT!
45 ms