Bryan Johnson· Author
Human testes operate 2-4°C cooler than core temp.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Human testes operate 2-4°C cooler than core temp.
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The test says outside the body. Yep. It's 3° cooler than the rest of the body. So 95 versus 98 degrees Fahrenheit.