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Old 12-20-2016, 04:37 PM
Ornery Bob Ornery Bob is offline
Join Date: Nov 2013
Posts: 931
The reason, in general, is because all biological systems exhibit variation. It's the basic building block of evolution. Mutations happen.

The fact that dumb people have smart kids doesn't rule out genetics. In fact it exposes exactly how genetics works! Every giraffe ever born had a short neck until one came along whose neck was longer and it helped and he passed it along... it all starts with a gene mutation that causes variation. Some work, some don't, some are meh.