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The Octopus's blood is blue, not red. Human blood is red ... | funfact.wiki | funfact.wiki
The Octopus's blood is blue, not red. Human blood is red because the iron-based protein Hemoglobin carries its oxygen; in octopuses that job falls to Hemocyanin, a Copper-based protein. Hemocyanin turns blue when it binds oxygen, and carries it better in the cold, low-oxygen sea.
  • Octopus
  • Hemoglobin
  • Hemocyanin
  • Copper
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The Octopus has three hearts. Two branchial hearts each push blood through one of its two gills to load it with oxygen, while a third systemic heart circulates the oxygen-rich blood through the rest of the body. The trio is thought to make up for the low efficiency of its blue blood.
  • Octopus
  • Heart
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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.
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The Statue of Liberty wasn't always green — it began shiny brown. Its skin is copper, so in 1886 it gleamed a coppery hue. Sea air, salt and pollution oxidized it into a blue-green patina, complete by about 1920. The patina isn't damage; it shields the metal.
  • Statue of Liberty
  • Copper
  • Patina
  • Chemistry
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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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Deep blue is one of the hardest colors in Fireworks. Blue usually comes from Copper compounds, but if the flame gets too hot, the copper-chloride emitters break down and the blue washes out. Pyrotechnicians must make an explosion burn “not too hot.”
  • Fireworks
  • Copper
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