Walking uses 200 muscles.
There are more stars in the universe than grains of sand on all the beaches on Earth. That’s at least a billion trillion!
More about space ❯
You’re leaving natgeokids.com
to visit another website!
Ask a parent or guardian to check it out first and remember to stay safe online.
You're leaving our kids' pages to visit a page for grown-ups!
Be sure to check if your parent or guardian is okay with this first.