Scientists researching the interactions between tectonic plates built an animated model of what the Earth may have looked like one billion years ago.
https://www.cnn.com/videos/world/2021/02/16/earth-history-tectonic-plates-movement-eg-orig.cnn
CNN – CNN INTERNATIONAL
Open a window to reduce virus spread, CDC tells schools in new ventilation recommendations
It's the first time the agency has separately emphasized the role ventilation plays in helping or preventing the spread...