>>629812
>You're born with a preset IQ amount and it can only get degraded, never upgraded
I don't think that is true. I think it's just way easier to lower your IQ rather than raise it.
At an early age, your neurons are making connections between themselves in order to build a functioning neural network. If this isn't encouraged, you'll end up with a brain with a less capable processing power and thus, a less intelligent individual.
I'm not saying that everyone is born equally intelligent, mind you. Since intelligence is based on neural interconnectedness, genes that affect this on a molecular level will probably make differing tiers of intelligence.
I could be wrong though.