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Astronomical summer officially arrives in the Northern Hemisphere — amidst a heat wave — at 4:51 p.m. ET. It's the earliest start to the season since 1796, thanks to quirks in the calendar.

Star Gazers #19-34M 1 minute Aug 26 - Sept 1, 2019 “Lunar Leapfrog: Part 2”

Appraisal: 1968 Gibson EB-2DC Bass Guitar & 1966 Ampeg B18-N Amp

Brazil now has the second-highest number of confirmed coronavirus cases in the world. The U.S. has recently banned all travel from Brazil, in a blow to pandemic-skeptic President Jair Bolsanaro.

Before she leaves for university, Zeta and Suzie have a serious chat.

A scientist must explain the Big Bang and dark energy so two comedians can understand it.

Student rider Tariq Meyers draws parallels between the 2011 Riders and the story of Jacob.

Bakhrom Ismoilov asks fellow students about their first two days on the 2011 Freedom Ride.

Marshall Houston asks: What is my identity? What are my beliefs? And what are my actions?

You're being chased by zombies, and understanding tangent vectors may save your life.