Here's a wild one. When astronauts live in space, they get taller! NASA scientists say astronauts can grow up to about 3 percent taller in orbit. For a grown-up who is 6 feet tall, that's up to about 2 inches. That's like adding a stack of cookies to your head!
So what's going on? Your backbone isn't one long bone. It's a tower of small bones with soft, squishy cushions called discs in between. Down here on Earth, gravity pulls on you all day and presses those discs together, just a little.
In space there's almost no pull squashing them. So the discs relax and spread out, and the whole tower gets longer. The astronaut didn't really grow like a kid grows. Their spine just stretched out like an accordion.
Now a bonus: you do a tiny version of this every night! Lying in bed takes the weight off your spine, so you wake up a smidge taller than you were at bedtime. Then gravity slowly squishes you back down during the day. For astronauts, the extra height doesn't last. Once they're home, gravity presses them back to their usual size.
So here's a question for dinner: if you lived on a space station for a year, what would you want to be tall enough to reach?