How Poverty Affects IQ

In a series of experiments, the researchers found that pressing financial concerns had an immediate impact on the ability of low-income individuals to perform on common cognitive and logic tests. On average, a person preoccupied with money problems exhibited a drop in cognitive function similar to a 13-point dip in IQ, or the loss of an entire night's sleep. But when their concerns were benign, low-income individuals performed competently, at a similar level to people who were well off, said...

 Condorcet's Final Days

Condorcet,proscribed by a sanguinary faction, formed the idea of addressing to his fellow-citizens a summary of his principles, and of his conduct in public affairs. He set down a few lines in execution of this project: but when he recollected, as he was obliged to do, thirty years of labour directed to the public service, and the multitude of fugitive pieces in which, since the revolution, he had uniformly attacked every institution inimical to liberty, he rejected the idea of a useless just...