physicsfun on Instagram: "Vortex II Coin Bank: interplay between potential energy of gravity and conservation of angular momentum- a simulation of a decaying orbit. A favorite inexpensive physics toy and fun with every coin saved! ➡️ Follow the link in my profile for more info on where to get this and other amazing items featured here on @physicsfun #physics #physicstoy #physicsfun #gravitywell #angularmomentum"

Toronto Culture on Instagram: "Canada and the northeastern U.S. are expected to face extreme mid-December cold, triggered by a polar vortex stretching event, according to MIT climatologist Judah Cohen. While the phrase “extreme cold on Earth” went viral, experts clarify it means colder than normal for the region, not colder than Siberia or Antarctica. Cold air from Siberia is expected to rush across the pole into Canada and the U.S., bringing frigid temperatures, frostbite risks, and a likely wh