Amazing Fact: Cephalopods Have Three Hearts and Blue Blood
Three hearts, copper-based oxygen transport, and genuinely blue blood: cephalopod anatomy has no interest in sounding plausible.
WHY IS THIS IN THE FILE?
Nobody took responsibility quickly enough.
Octopuses, squids, cuttlefish, and other cephalopods run on a circulatory system that sounds invented after midnight.
They have three hearts: two branchial hearts move oxygen-poor blood through the gills, while one systemic heart pumps oxygenated blood through the rest of the body.
Their blood is literally blue because it uses hemocyanin, a copper-containing molecule, to carry oxygen. Human blood relies on iron-containing hemoglobin instead.
The blue is chemistry, not mood, aristocracy, or a marine branding strategy.
Source: Smithsonian Ocean: Cephalopods.
Mina Foss
Keeper of Amazing Facts: real science, history, engineering, animals, and other true things too strange to leave to fake-news accounts.
STATUS: UNRULY
“Normal” was considered and rejected.
KNOWN ASSOCIATES: readers, loiterers, people who should know better.
PUSH THE WEIRD BUTTON
A clerk has been notified. They are furious.