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An Octopus's systemic Heart stops beating whenever it swi... | funfact.wiki | funfact.wiki
An Octopus's systemic Heart stops beating whenever it swims. Because the heart that drives blood through the whole body pauses during each jet, octopuses tire fast in open water. That's why many prefer to crawl along the seafloor instead of swimming long distances.
  • Octopus
  • Heart
  • Ocean
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During World War II, the US Navy found the ocean floor seemingly rising every night on sonar. The culprit was millions of lanternfish forming a 'deep scattering layer'—hiding in the deep ocean by day and rising near the surface at night, their swim bladders reflecting the sonar signals.
  • World War II
  • Ocean
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Diving deep into the ocean causes symptoms like alcohol intoxication — the "martini effect." Every 15 meters of depth supposedly equals one martini. Rising water pressure dissolves more nitrogen into the blood, producing a narcotic effect on the nervous system.
  • Ocean
  • Diving
  • Submersion
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Submerging your face in cold water triggers the "diving reflex." Heart rate drops 10-25% and blood flow shifts to protect the brain and heart. This ancient mammalian reflex is especially strong in babies under six months.
  • Human body
  • Mammal
  • Ocean
  • Evolution
  • Submersion
  • Reflex
  • Biology
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An octopus has roughly 500 million neurons, and more than two-thirds of them are distributed across its eight arms rather than its central brain. The brain issues high-level commands while each arm independently handles the details—a decentralized nervous system.
  • Octopus
  • Brain
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In 2009, a veined octopus was observed carrying coconut shells and using them as shelter—the first documented tool use by an invertebrate. Octopuses can also solve puzzles, open jars, escape aquariums, and learn by watching other octopuses.
  • Octopus
  • Invertebrate
  • Tool
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