In 2024, scientists built a window that kept a model house about 7°C cooler, without electricity or blocking the view

Engineers in South Korea have developed an innovative smart window that cools spaces sans electricity. This remarkable glass not only reflects heat but also radiates it into the cosmos. With the ability to generate electricity from rainwater and self-defrost, it stands as a promising solution for lowering cooling expenses globally, though further refinements are essential for mass production and durability.