It's a thing in from thousands of years ago https://en.m.wikipedia.org/wiki/Yakhch%C4%81l https://en.m.wikipedia.org/wiki/Yakhch%C4%81l and today https://en.m.w

It's a thing in from thousands of years ago https://en.m.wikipedia.org/wiki/Yakhch%C4%81l https://en.m.wikipedia.org/wiki/Yakhch%C4%81l and today https://en.m.wikipedia.org/wiki/Passive_daytime_radiative_cooling https://en.m.wikipedia.org/wiki/Passive_daytime_radiative_co... for PDRC there are a couple good videos about it from NightHawkInLight https://youtu.be/N3bJnKmeNJY?t=19s https://youtu.be/N3bJnKmeNJY?t=19s, https://youtu.be/KDRnEm-B3AI https://youtu.be/KDRnEm-B3AI and Tech Ingredients https://www.youtube.com/watch?v=5zW9_ztTiw8 https://www.youtube.com/watch?v=5zW9_ztTiw8 https://www.youtube.com/watch?v=dNs_kNilSjk https://www.youtube.com/watch?v=dNs_kNilSjk