this post was submitted on 24 Feb 2026
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Uplifting News

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[extract]

The study is small and limited to the greater Salt Lake City region of Utah. But it shows how physical mementos such as locks of hair stashed in scrapbooks for decades can reveal how our environment has changed over time.

Researchers gathered 47 hair samples dated from 1916 to 2024 and called in Diego Fernandez, a geochemist at the University of Utah, to analyze the lead content in the hair. The analysis didn’t distinguish between lead in the sheathlike cuticle that surrounds a hair and that found in the hair itself. The former would have been picked up from contaminated air, and the latter would have stemmed from the consumption of contaminated food or water.

The trend over time is stunning. Peak lead rates occurred in samples from the 1960s, when lead was enriched by some 120 times compared with 2020–2024 samples. But since the 1960s, lead exposure rates steadily plummeted.

The decline occurred alongside the formation of the Environmental Protection Agency in 1970 and the passage of landmark legislation, including the Clean Air Act and the Clean Water Act, in the same decade, although the researchers also note that the greater Salt Lake City region had been home to two smelting facilities that closed during that period.

Still, the decline is stunning. “I think it’s kind of a showstopper for showing the power of environmental protections,” Smith says.

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[–] Strider@lemmy.world 23 points 3 days ago (2 children)

While this is good news consider that it literally made people dumber. As such, 5he average intelligence has also risen again.

However, the people in charge might be the ones with the lowest intelligence now.

[–] toiletobserver@lemmy.world 7 points 3 days ago (1 children)
[–] Strider@lemmy.world 3 points 3 days ago

Apologies if I sometimes post obvious things. 😁

[–] Aatube@kbin.melroy.org 2 points 3 days ago (1 children)

the average intelligence used to fall?

[–] Strider@lemmy.world 3 points 3 days ago (1 children)

Yes, indeed. Just read that yesterday on a possibly related report with more lead absorption the intelligence dipped.

[–] Aatube@kbin.melroy.org 1 points 2 days ago (1 children)

could you link it? the flynn effect is that average intelligence has been steadily rising ever since IQ tests were introduced faster than could be explained by genetic variation

[–] Strider@lemmy.world 1 points 1 day ago (1 children)

I'm sorry, that specific one was just at the time something random that I saw with a lot of other news. So I have no idea where or which it was. But there are enough References to lead and iq like this (German):

https://www.welt.de/wissenschaft/article237429189/Giftiges-Schwermetall-Niedrigerer-IQ-durch-Blei-in-Abgasen.html

[–] Aatube@thriv.social 1 points 7 hours ago

(FWIW, it says lead emissions dropped the IQ of those affected by 2.6 points on average, not the average intelligence which has not dropped.)

[–] buddascrayon@lemmy.world 1 points 1 day ago

Now we just have to survive the final throws of the lead brained boomers that have taken complete control of every aspect of our government.

[–] supersquirrel@sopuli.xyz 11 points 3 days ago* (last edited 3 days ago) (1 children)

Good news without a lead time.

[–] mysticpickle@lemmy.ca 5 points 3 days ago
[–] decapitae@sh.itjust.works 6 points 3 days ago (1 children)

Yay! Less lead! But now we have X and insta and that doesn't show up in hair samples.

[–] Zorque@lemmy.world 1 points 3 days ago

What about microplastics?

[–] PlaidBaron@lemmy.world 3 points 3 days ago (2 children)

This is bad news for me. Im in the lead poisoning business.

[–] how_we_burned@lemmy.zip 2 points 1 day ago

Have you heard of asbestos my good friend. Despite what people think its not even properly banned. Shit we put it in kids toys and makeup still

[–] sga@piefed.social 2 points 2 days ago

sorry to disturb your business kind sir