For thousands of years, humans, and plants and animals long before that, have been using frozen "sky water" to keep warm. which sort of doesn't make sense.
Because snow is cool.
You might even say it's… ice cold.
No one knows for sure who built the first igloo, but with the right fit and the right physics, snow can actually warm you better than the inside of a tauntaun.
"You'll be ok, Luke"!
So, how can something cold keep you cozy?
The vast, frozen Arctic is one of the most forbidding environments on our planet, yet, the Inuit have managed to live there for about 5,000 years.
Out on the pack ice, winter temperatures reach 50 degrees below zero , and when it's that cold, surviving means finding shelter.
It's not an area known for its forests, so nomadic hunters learned to build with the only thing available: snow.
Eskimo languages really do have dozens and dozens of different words for snow, because there are a lot of different types, and the type of snow you choose can dictate whether your igloo keeps you warm, or turns you into a Homo sapiensicle.