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17 Tonnes of Spinning Glass: Making the World's Largest Telescope
17 Tonnes of Spinning Glass: Making the World's Largest Telescope
17 Tonnes of Spinning Glass: Making the World's Largest Telescope

17 Tonnes of Spinning Glass: Making the World's Largest Telescope - Tom Scott

Tom Scott
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Hi, I'm Tom Scott. These are some of the things I've made and done. They'll probably come back to haunt me in a few years' time. (Want to get in touch about anything? Use the "contact me" link below, not YouTube messages!)

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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 To Make Parabolic Mirrors From Space Blankets - NightHawkInLight

Parabolic mirrors are useful for everything from solar power to telescopes to holographic projection. They're usually very difficult to make by traditional means, but this video takes a different approach. Check out my sponsor Rayton Solar here: With their incredible silicon cutting process via a particle accelerator they're able to make solar panels with virtually zero waste and a higher efficiency result. AN OFFERING STATEMENT REGARDING THIS OFFERING HAS BEEN FILED WITH THE SEC. THE SEC HAS QUALIFIED THAT OFFERING STATEMENT, WHICH ONLY MEANS THAT THE COMPANY MAY MAKE SALES OF THE SECURITIES DESCRIBED BY THE OFFERING STATEMENT. IT DOES NOT MEAN...

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: • At the Royal Air Force training centrifuge in Farnbrough, pilots learn how to avoid G-LOC: g-induced loss of consciousness. Let's talk about g-force, about jerk, and about how to keep circulation flowing to your brain. FAQs: * Isn't 3.6g a really low g-tolerance? * Yep. Turns out I would not qualify to be a fighter pilot. The average range for g-tolerance is 4-6; no-one was expecting me to pass out. The centrifuge team do not deliberately try to G-LOC people! To be fair,...

Would Headlights Work at Light Speed?

If you were driving at the speed of light and turned on your headlights, what would happen? Twitter: Instagram: Sources and extras below!! Thanks to Jude for asking me this question on twitter! “The Life of the Cosmos” by Lee Smolin: “In Search of the Multiverse” by John Gribbin: “The Pig That Wants to be Eaten: by Julian Baggini: Relevant MinutePhysics videos: light slowing down in glass: a different perspective from Sixty Symbols about light slowing down: Why is “c” the speed of light? Car at light speed: Light speed is the same in all inertial frames of reference: Relativistic addition of velocities: doppler shift: Relativity: Light speed and...

British Numbers confuse Americans - Numberphile

Title changed for Grey!!! Two Americans living in England discuss the numeric nuances which cause them problems. More links & stuff in full description below ↓↓↓ Featuring... Uber YouTuber CGPGrey - Linguist Lynne Murphy - The good bits of animation by Pete McPartlan - Music by Alan Stewart - Interviews and video by Brady Haran - NUMBERPHILE Website: Numberphile on Facebook: Numberphile tweets: Subscribe: Videos by Brady Haran Patreon: Brady's videos subreddit: Brady's latest videos across all channels: Sign up for (occasional) emails: Numberphile T-Shirts: Other merchandise:

Circular Saw Kickback Killer (We used science to make tools safer) - Smarter Every Day 209

Get your first audiobook free when you try Audible for 30 days visit → or text smarter to 500 500! Contact us about putting AI in tools → ⇊ Click below for more links! ⇊ Click here if you're interested in subscribing: Get a free audio book! ⇊ Click below for more links! ⇊ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET SMARTER SECTION Technical details about what we're doing: We're working on a time-series problem called a Sequence Classification. Recurrent Neural Networks called Long Short-Term Memory (LSTM) networks are good for that. It’s what they use for natural language processing because it can remember context...

How Computers Compress Text: Huffman Coding and Huffman Trees

Computers store text (or, at least, English text) as eight bits per character. There are plenty of more efficient ways that could work: so why don't we use them? And how can we fit more text into less space? Let's talk about Huffman coding, Huffman trees, and Will Smith. Thanks to the Cambridge Centre for Computing History: Thanks to Chris Hanel at Support Class for the graphics: Filmed by Tomek: And thanks to my proofreading team! I'm at on Twitter at on Facebook at and on Snapchat and Instagram as tomscottgo

Tom Fell Through A Frozen Lake In Estonia

On a bench in Tartu, Estonia, we welcome Paul (@cr3) along with art from Simon (@mushybees) to talk about our road trip, an abandoned submarine base, and, yes, the incident where Tom fell through ice into a frozen lake. Also, rainbow Comic Sans. TOM: -- MATT: -- PAUL: And thanks to our artist, Simon Coxall, !

Drones vs Lightning ⚡

At the University of Manchester's High Voltage Laboratory, we see what happens when a DJI Phantom 3 drone gets hit with an electrical impulse of 1.4MV - basically, a lightning strike. Actually, two Phantom 3 drones. We had a backup. Thanks to the team at the High Voltage Lab! Here's their side of the story: And here's a teardown of the drone: The University of Manchester's YouTube channel: You can also follow on Twitter: The HV Lab Vidyadhar Peesapati Manchester Energy School of Electrical and Electronic Engineering Main camera: Fraser Cottrell / Edited by Michelle Martin / @mrsmmartin Audio mix by Matt Gray...

How a Giant Telescope Works

From ESOcast, explore the state-of-the-art technology behind the Very Large telescope, which has provided astronomers with an unequalled view of the Universe. To obtain the sharpest images of the sky, the VLT has to cope with two major effects that distort the images of celestial objects. The first one is mirror deformations due to their large sizes. This problem is corrected using a computer-controlled support system — active optics — that ensures that the mirrors keep their desired shapes under all circumstances. The second effect is produced by Earth's atmosphere, which makes stars appear blurry, even with the largest telescopes....

Vacuum Decay: The Quantum Glitch That Could Destroy The Universe | Answers With Joe

It's the ultimate nightmare scenario: A bubble in spacetime that grows at the speed of light and eventually destroys the universe. That's vacuum decay. Get the shirt! Support me on Patreon! Follow me at all my places! Instagram: Snapchat: Facebook: Twitter: =============== LINKS LINKS LINKS Fermilab TED Kurzgesagt Veritasium =============== TRANSCRIPT: Try to imagine somewhere in the universe, a tiny subatomic bubble formed. A bubble inside which all physics as we know it ceases to exist. Particles don’t form into atoms, atoms can’t turn into molecules, all the fundamental forces cease to have any meaning. And then that bubble expands outward at the speed of light, obliterating everything it touches. Asteroids, comets, planets,...

Freezing 200,000 Tons of Lethal Arsenic Dust

Giant Mine sits near Yellowknife, in the Northwest Territories of Canada. Once it was a productive gold mine, but after the gold ran out, the mining company went bankrupt and left the government to clean up the mess: enough arsenic trioxide dust to kill everyone on Earth. The solution: freezing it, at least for now. Thanks to all the team at the Giant Mine Remediation Project! More about them: The history of Giant Mine and the local First Nation people, a story I'm not qualified to tell: Edited by Michelle Martin (@mrsmmartin) I'm at on Twitter at on Facebook at and on...

6 Animals with Oddly Human Behavior

According to research, some animals act in ways that seem oddly similar to the things we do. We're conducting a survey of our viewers! If you have time, please give us feedback: Hosted by: Olivia Gordon ---------- Support SciShow by becoming a patron on Patreon: ---------- Dooblydoo thanks go to the following Patreon supporters: Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, Inerri, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Bella Nash, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von...

How Zero-G Planes Work

The European Space Agency offered me a seat on their zero-g plane: it's an Airbus A310 that flies parabolic maneuvers, pulling up into the sky and then arcing back down, giving its passengers about 20 seconds of weightlessness (or "microgravity") at a time. Here's how it works. Some people would have filmed their script on the ground, and just messed about while floating. I decided to go for something a bit more challenging. ** If you're a masters or PhD student from an ESA member state, and zero-g sounds like your thing, have a look at the Fly Your Thesis program: --...

58 and other Confusing Numbers - Numberphile

Squarespace: More links & stuff in full description below ↓↓↓ More linguistics on Numberphile: Billion and Trillion: Tom Scott on numbers and linguistics - a discussion with spans counties, countries, continents and the far reaches of space. Tom's own channel is: Art and animation by Pete McPartlan Support us on Patreon: NUMBERPHILE Website: Numberphile on Facebook: Numberphile tweets: Subscribe: Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): Videos by Brady Haran Brady's videos subreddit: Brady's latest videos across all channels: Sign up for (occasional) emails: Numberphile T-Shirts: Other merchandise:

Is It Dangerous To Talk To A Camera While Driving?

I'm visiting the University of Iowa's National Advanced Driving Simulator, to answer a question: how unsafe is it for me to vlog while driving? Is vlogging while driving dangerous? The team at the simulator are the experts to ask. More about the National Advanced Driving Simulator: or on Twitter: Camera operator: Jasmine Putney Edited: Michelle Martin (@mrsmmartin) I'm at on Twitter at on Facebook at and on Snapchat and Instagram as tomscottgo

How Large Can a Telescope Be?

From ESOCast: on clear nights we can look up at the stars and marvel at the vastness of the universe. Our eyes quickly adapt to the dark. As our pupils widen, more light streams onto our retinas and fainter stars become more visible. But the light-collecting area of the human eye is tiny. To peer much deeper into the night sky astronomers need telescopes with enormous primary mirrors. How large does modern technology allow us to build telescopes? How far into space can they see?

Inside The Giant American Freezer Filled With Polar Ice

Welcome to the US National Ice Core Laboratory in Denver, Colorado, where there's a giant freezer filled with 20km of ice cores from Greenland and the Antarctic. Here's why. Thanks to everyone at the US National Ice Core Laboratory! You can find out more about them here: The Ice Core Laboratory is supported by the National Science Foundation: Edited by Michelle Martin, @mrsmmartin I'm at on Twitter at on Facebook at and on Snapchat and Instagram as tomscottgo

FizzBuzz: One Simple Interview Question

There are a lot of opinions on how to hire coders, and most of them are terrible. The opinions, that is, not the coders. But a basic filter test to make sure someone can do what they say they can: that seems reasonable, and FizzBuzz is one of the more common tests. Even now, interviewers use it. Let's talk about why it's tricky, and how to solve it. Imran's blog post: Other approaches for pretty much every language: Thanks to the Cambridge Centre for Computing History: The thing behind me is their Megaprocessor: And thanks to my proofreading team! I'm at on...

The Moiré Effect Lights That Guide Ships Home

I'd never heard of moiré effect beacons until I got an email asking me about them. It seemed like a really clever idea - but it was really hard to research. Or at least it was, until I stumbled upon one magic phrase that revealed its history. It turns out this thing's called an "Inogon leading mark" or "Inogon light" -- Inogon, not Inogen -- and it's a Swedish invention from the 1980s. But there's still a question: why is being used to mark an undersea cable, instead of guiding people home? (Full disclosure: there were some weird strobing effects from the...

The Battery That's Lasted 176 Years

GUEST VIDEO! Go subscribe to Sally's channel: In a laboratory at Oxford University sits the Oxford Electric Bell, which has spent 176 years constantly ringing. And no-one's quite sure what the battery that powers it is made of... Add Sally on all the social networks: Twitter: Facebook: Instagram: Website: Snapchat: sally.lepage Thanks to camera operator Mikayla Hunter: And thanks to the University of Oxford's Physics Department for letting us film the bell! References: Croft (1984) The Oxford electric bell, Eur. J. Phys. Croft (1985) The Oxford dry pile, Clarendon Laboratory Historical Notes No. 3 The Clarendon Dry Pile, Department of Physics website

Zero-G Experiments on Earth: The Bremen Drop Tower

In Bremen, Germany, there's a tower more than a hundred metres high: it's called the Fallturm, or the Drop Tower. If you want a cost-effective way to test an experiment in microgravity -- and your project can survive some pretty strong deceleration -- then this might well be a good place for you. And then there's the slingshot... Thank you to all the team at the Drop Tower! More info: Behind the Scenes on the Park Bench: DoP / Camera: Matt Gray - - - @unnamedculprit Editor: Michelle Martin - @mrsmmartin I'm at on Twitter at on Facebook at and on Snapchat...

Characters, Symbols and the Unicode Miracle - Computerphile

Audible free book: Representing symbols, characters and letters that are used worldwide is no mean feat, but unicode managed it - how? Tom Scott explains how the web has settled on a standard. More from Tom Scott: and EXTRA BITS: Data Security: This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: