One of the things that I enjoyed most about my early sojourn in Korea, especially in winter, was the chance to sit or sleep on an ondol heated floor—which can be best described as an under-the-floor heating system.

I just loved that toasty feeling your body had when you sat on the floor to eat on a very cold winter day or curling up on my yo—a traditional sleeping bag similar to a futon—at night.

Now it turns out that what is “believed to be the world’s oldest underfloor stone-lined-channel heating systems have been discovered in Alaska’s Aleutian Islands in the U.S.”

Wow, that’s pretty cool or should I say hot?

Read more here.