[kiba]

which may have weakened the power of selection to weed out mutations leading to intellectual disabilities

What the hell does it mean? Smart people aren't breeding? Intellectually disabled people are breeding?

[firefoxman1]

It means that in developed countries there is almost no natural selection, and it's unethical to weed out weak genes synthetically because that's called a holocaust.

[lostnet]

Actually weeding out "weak" genes is eugenics, it is increasingly done without genocide. This appears to be a larger ethical issue today (and certainly in the 60s and 70s) than during the holocaust.

[gizmo686]

It means that the amount by which smart people out breed less smart people has decreased.

[charonn0]

For a detailed explanation, see the soon-to-be-reclassified-as-a-documentary film Idiocracy: http://www.imdb.com/title/tt0387808/

[meaty]

Refer to the film "idiocracy" for a dystopian vision of why this is happening and what the outcome might likely be.