It would also be great if we had eyes in the back of our heads to see 360 degrees. Oh, and we should be able to hear above 20,000hz in order to detect small pr

It would also be great if we had eyes in the back of our heads to see 360 degrees. Oh, and we should be able to hear above 20,000hz in order to detect small prey more easily. If we don’t have a particular adaptation there are a few basic explanations: - it just wasn’t on the path: the RNG just simply didn’t produce this outcome - it was on the path but it was sacrificed for something else (for humans this is typically our big, energy hungry brains) - it was on the path but just didn’t offer a selection advantage A scenario I just came up with: Half of all humans had IR vision, but when we got control of fire, they were outcompeted by those who weren’t “blinded” by the IR output of the flames.