Tiny amounts of lead, chemical flame retardants and organophosphate pesticides, among other toxins, course through the blood of nearly every American. But just how much worry is a little poison worth?
A lot, especially when considering the cumulative effects of this chemical cocktail on children, warns a video unveiled Thursday during an environmental health conference in Ottawa, Canada. The seven-minute project, “Little Things Matter,” draws on emerging scientific evidence that even mild exposures to common contaminants can derail normal brain development — lowering IQs and raising risks of behavioral conditions such as attention deficit hyperactivity disorder, or ADHD.
“The chemical industry argues that the effect of toxins on children is subtle and of little consequence,” co-producer Bruce Lanphear, an environmental health expert at Simon Fraser University in British Columbia, states in the video. “But that is misleading.”
Our technology may be getting smarter, but a provocative new study suggests human intelligence is on the decline. In fact, it indicates that Westerners have lost 14 I.Q. points on average since the Victorian Era.
What exactly explains this decline? Study co-author Dr. Jan te Nijenhuis, professor of work and organizational psychology at the University of Amsterdam, points to the fact that women of high intelligence tend to have fewer children than do women of lower intelligence. This negative association between I.Q. and fertility has been demonstrated time and again in research over the last century.
But this isn’t the first evidence of a possible decline in human intelligence.
“The reduction in human intelligence (if there is any reduction) would have begun at the time that genetic selection became more relaxed,” Dr. Gerald Crabtree, professor of pathology and developmental biology at Stanford University, told The Huffington Post in an email. “I projected this occurred as our ancestors began to live in more supportive high density societies (cities) and had access to a steady supply of food. Both of these might have resulted from the invention of agriculture, which occurred about 5,000 to 12,000 years ago.”
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