Another month, another rationality quotes thread. The rules are:
Provide sufficient information (URL, title, date, page number, etc.) to enable a reader to find the place where you read the quote, or its original source if available. Do not quote with only a name.
Post all quotes separately, so that they can be upvoted or downvoted separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
Do not quote yourself.
Do not quote from Less Wrong itself, HPMoR, Eliezer Yudkowsky, or Robin Hanson. If you'd like to revive an old quote from one of those sources, please do so here.
No more than 5 quotes per person per monthly thread, please.
The biological hypothesis pretty much means genetics. There are a lot of environmental influences (from eating lead paint chips to being deficient in iodine to being dropped on one's head as a child) that are well-known to affect IQ.
Another month, another rationality quotes thread. The rules are: