This week's guest video comes from Active Galactic Videos: go subscribe! They got to walk on the dish of a telescope:

At the Richard F. Caris Mirror Lab, under the football stadium of the University of Arizona, there's an enormous rotating furnace, keeping tonnes of glass heated as it forms the mirrors for the Giant Magellan Telescope. Here's a look inside!

How The Arecibo Telescope Could Help Save The World

The radio telescope at the Arecibo Observatory in Puerto Rico can do something that most radio telescopes can't: it can transmit. And that's useful fo...

58 and other Confusing Numbers - Numberphile

Squarespace: More links & stuff in full description below ↓↓↓ More linguistics on Numberphile:

G-Force, Jerk, and Passing Out In A Centrifuge

Thanks to the Starrship team for arranging this! I'm also over on their channel, flying with the Blades: •...

How to Wrangle a Giant Telescope Mirror

Fascinating account of how technicians remove a giant telescope mirror at the Very Large Telescope Array in Chile and then clean and refinish it.

A Language Made Of Music

Today's guest is 12tone! Go subscribe: - and here's their video about the Imperial March: htt...

Tilting an Icy Floor Until You Fall Over: WinterLab

If you're in Canada, you need good winter boots. But how do you know whether they're actually safe, or whether you'll fall over the first time you ste...