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Speed just did an internet stream from underwater. The tech is genuinely wild, because water blocks every wireless signal we have.Your phone disconnects in 4 inches of water. WiFi and cellular both run in the gigahertz range, and seawater absorbs those frequencies as heat. Same physics as your microwave oven, which operates at 2.45 GHz. By 4 inches deep, signal strength has dropped more than 99%.This is why scuba divers have used hand signals for 80 years. It's why submarines have to surface to
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1:29
Humans win. Not close. The mechanism is the most underrated story in evolutionary biology.You have 2 to 4 million sweat glands. The cheetah has zero functional cooling beyond panting, which loses CO2 and water faster than it dumps heat. After one full sprint, a cheetah's core temperature spikes 1.5°C and it needs roughly 30 minutes of forced rest before it can move again. At 100km, the human is asleep before the cheetah finishes.The horse has the second-best cooling here and still loses. Horses
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