On what might seem like a different subject, here is the scan of a photo I took at a doctor's office.
This is an eye chart for use by patients that can't read the usual letters of English -- E FP TOZ, and so on. The
testee's answers will be whole words for common shapes such as square, circle and heart.
Based on my understanding of natural selection, I declare that we humans will, over many centuries, become progressively more
blind. Now that we've invented methods of vision correction such as eyeglasses and laser surgery, there is no longer any evolutionary pressure
to kill off those of us born with poor vision because we couldn't see that saber-tooth tiger crouching over there in the bushes.
The chart at left is designed -- and designated as
such -- for illiterates.
And at this particular medical facility, as it turns out, there's no doubt evey patient is illiterate.