Here's the article without a paywall: https://www.scientificamerican.com/article/discarded-1990s-energy-invention-makes-a-comeback/ https://www.scientificameri

Here's the article without a paywall: https://www.scientificamerican.com/article/discarded-1990s-energy-invention-makes-a-comeback/ https://www.scientificamerican.com/article/discarded-1990s-e... Spoiler: The invention is triple-pane windows.