Duolingo can’t teach you how to speak a language, but now it wants to try

Duolingo has been wildly successful. It has pulled in 500 million total registered learners, 40 million active users, 1.5 million premium subscribers and $190 million in booked revenues in 2020. It has a popular and meme-ified mascot in the form of the owl Duo, a...

Device that combines air circulation with UV-C light deployed in first U.S. homes to help decrease COVID-19 transmission risk

Now that we know the virus that causes COVID-19 can be transmitted via aerosol (tiny particles in the air that can hang around for a long time), researchers and engineers globally have turned their attention to helping promote air circulation where risk exposure is...