30 reactions · 5 comments | We’ve built our world-class Xfinity network to deliver the very best WiFi at home AND on the go with more than 23 million Xfinity WiFi hotspots outside of the home. So we can connect customers wherever they go. | Comcast | Facebook

37K views · 1.6K reactions | Don’t lose your chill, but helium is the coolest element. (It's got the lowest boiling point!) Apply pressure, and it gets even cooler. Find out how pressurized helium helps keep the cryocooler of Webb’s MIRI instrument only about 7 Kelvin (-448 degrees F, or -266 degrees C) in the latest episode of Elements of Webb. ❄️ Credit: NASA's Goddard Space Flight Center | NASA's James Webb Space Telescope | Facebook