In 1936, the Hungarian endocrinologist Hans Selye injected rats with a hormone from cow’s ovaries. Things did not go well. The lab rats developed bleeding ulcers.
Next, Hans injected the rats with a salt solution and a hormone isolated from a cow’s placenta. The rats developed the same symptoms. Next up was an injection made from kidneys and spleens, Kelly McGonigal writes in her book The Upside of Stress.
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