Early that morning, a tissue sample from a cow in Washington State had tested positive for bovine spongiform encephalopathy (BSE)—also known as mad cow disease. That’s a rare brain disorder that kills

Early that morning, a tissue sample from a cow in Washington State had tested positive for bovine spongiform encephalopathy (BSE)—also known as mad cow disease. That’s a rare brain disorder that kills both animals and humans. In Europe, hundreds of thousands of cows have caught the disease. And 150 humans have died from it.

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