Unintended Consequences Blog
Inventions, policies, and systems designed with good intentions — and the surprising results they triggered.
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May 05, 2026
Ep 3
5 min
In 1921 Thomas Midgley Jr. added tetraethyl lead to gasoline to silence engine k...
In 1921 Thomas Midgley Jr. added tetraethyl lead to gasoline to silence engine knock, never imagining the additive would raise blood-lead levels in entire gener…
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May 04, 2026
Ep 2
5 min
Unintended Consequences — Episode Brief
In 1935, Australia brought 102 cane toads from Hawaii to battle sugarcane beetles — but the toads bred into the billions and killed native predators instead.
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May 04, 2026
Ep 1
5 min
Delhi's British government paid for dead cobras to cut snake numbers, but the bo...
Delhi's British government paid for dead cobras to cut snake numbers, but the bounty led to breeding, and scrapping it released more snakes into the city.
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