Octopuses have three hearts, and two of them stop beating when the octopus swims.
The third heart keeps circulation going, which is one reason swimming is so exhausting for them—they often prefer crawling along the seafloor instead.
Bonus weird detail: their blood is blue because it uses hemocyanin, a copper-based molecule, instead of the iron-based hemoglobin in humans.
Honey never spoils.
Archaeologists have found pots of honey in ancient Egyptian tombs that are still edible after thousands of years. It lasts because it’s very low in water and naturally acidic, which makes it hard for microbes to grow. Bees also add enzymes that produce small amounts of hydrogen peroxide, helping preserve it even more.
If you want, I can tell you another weird fact—science, history, space, or human body.
Octopuses have three hearts, and two of them stop beating when the octopus swims.
Also: because their blood uses copper-based hemocyanin instead of iron-based hemoglobin, it’s blue.