How One Mistake Created “Killer Bees”

One man accidentally created the deadliest bee on Earth.
In 1957, one removed barrier unleashed nature's deadliest accident. A geneticist tried to breed the perfect tropical bee. Instead, 26 African queen bees escaped a Brazilian lab and created something worse than either parent species.
Africanized "killer bees" chase threats over a quarter mile. They've killed roughly 1,000 people. And they've spread from Brazil to the American Southwest — still expanding, still unstoppable.
One human mistake. An invasive species we can never reverse.

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