Here's one of my favorites:
Woolly mammoths were still alive when the Egyptians were building the pyramids.
We think of mammoths as ancient prehistoric creatures that died out with the dinosaurs — but they were actually around much more recently.
The Great Pyramid of Giza was completed around 2560 BCE. Meanwhile, a small, isolated population of woolly mammoths was still living on Wrangel Island, up in the Arctic Ocean off Siberia. They didn't go extinct until around 1650 BCE.
That means for about 900 years, humans were building pyramids and pharaohs were ruling Egypt while mammoths were still wandering around and munching on grass up north.
Wild timeline, right?
Want another one — science, history, or just totally weird?
Challenge accepted — here's a good one:
There's a hidden ocean inside the Earth.
About 400 miles underground in the mantle, there's a mineral called ringwoodite that acts like a super-dense sponge. It doesn't hold liquid water, it traps water molecules inside its crystal structure.
Scientists estimate that transition zone could hold 3x as much water as all of Earth's surface oceans combined.
So when you picture Earth's water, don't just picture oceans, glaciers, and rain — picture the planet itself slowly soaking and cycling an entire extra ocean through rock over millions of years.
Want another one about space, history, or the human body?
Since I don't know what you do know, here's my best bet for something you probably don't:
There's an animal that can theoretically live forever.
It's a tiny jellyfish called Turritopsis dohrnii, only about 4.5mm wide. When it gets old, injured, sick, or stressed, it doesn't die — it sinks to the ocean floor, collapses its body back into a blob, and turns back into a baby polyp. Then it grows up all over again.
It can do this over and over indefinitely. It's biologically immortal. It can still be eaten by predators, but barring that, it never dies of old age.
A couple quick bonuses in case you already knew that one:
- The dot over the letters 'i' and 'j' has a name — it's called a tittle.
- Cleopatra lived closer in time to the iPhone (about 2,037 years) than to the construction of the Great Pyramid (about 2,530 years).
- Wombats poop in cubes. They're the only animal known to make cube-shaped poop, to keep it from rolling away.
Want another one from space, history, or the human body?