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Old 12-21-2016, 02:24 PM
Machine Elf Machine Elf is offline
Join Date: Feb 2007
Location: Challenger Deep
Posts: 11,476
Originally Posted by Ornery Bob View Post
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.
Originally Posted by NetTrekker
Genetics. Siblings usually grow up in similar environments but have varying levels of cerebral talent.
No doubt genetics plays a role, but the existence of the Flynn effect proves that genetics can't possibly be the only factor. The genetic makeup of humanity can't change nearly fast enough in 100 years to explain the Flynn effect - but our environment can.