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New Post: Lenses, Mirrors, Cameras, and Telescopes!
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If you want to really understand just how weird light is, you have to imagine the perspective of someone from a long, long time ago. Why not choose, for example, a farmer in Southeast Asia a few thousand years ago. Put yourself into the farmer’s shoes – unless this is a barefoot farmer, in which case I’m speaking only metaphorically. You’re relaxing after a long day of work. Feel the rough, scratching fabric of the shirt on your back. Feel the so...
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Critical Questions: Why does the sound of an ambulance or car engine seem to change as the vehicle passes by? Why do we hear a loud bang when a supersonic jet flies by? What does all this have to do with the Big Bang? I’d like you to do me a favour. This is especially important if you’re in a public place, surrounded by lots of strangers. I’d like you to imitate, out loud and at a significant volume, the sound of a racecar going by. The noise y...
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We're back, with our first new post in millenia!

New Post: Introduction to Waves and Sound
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New Post: The Experiments Most Likely to Shake Up the Future of Physics
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Have them in circles
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Critical Questions: What is resonance? Can you shatter a wine glass just by singing at it? In the same way that it must be illegal to talk about buoyancy without telling the story of Archimedes and the crown, everyone who teaches resonance brings up the Tacoma Narrows Bridge at one point or another. This is probably because there is some cool old black-and-white footage of the bridge swaying and rippling impossibly in a stiff breeze, as follows...
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New Post: Waves
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New Post: To Stir, Or Not To Stir
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New Post: Free Energy! Only $7610
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Have them in circles
42 people
Matteo Valerio Falessi's profile photo
Umair Razi's profile photo
Subhajit Ganguly's profile photo
Dat Nguyen's profile photo
Joel khongthang Khs's profile photo
William Hurr's profile photo
Alpha Tutors LTD's profile photo
bilal kenfaoui's profile photo
anna rad's profile photo
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Pop Physics is an online textbook for people who hate textbooks.