Physicist in a cancer clinic. I show what radiation, gravity, heat and vacuum do to a human body, in real numbers.
Joined September 2026
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70 Gy is ten times a lethal dose. Our cancer patients get it and walk out after every session.
I'm a physicist in a cancer clinic. Two tricks make it survivable, and the second one is pure math.
Guess how many cancer cells are left after 35 sessions.
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X-rays go through you. Protons stop inside you.
One beam each, same tumour: the X-rays give the heart 33% of the tumour dose, the protons about 1%.
Guess why most patients, mine included, still get X-rays.
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One Hiroshima bomb every second for 150 years, released in a single moment. That's a 10 km rock at 20 km/s.
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Popular science says one neutrino hits you in your whole life.
Detector data says about one a week.
Borexino in Italy sees about 185 solar neutrino hits per 100 tonnes of liquid a day. Scale it to a 70 kg body.
Send this to the friend who loves space facts.
Every space movie gets this wrong.
No suit, deep space. How long until you freeze? Reply with your guess before you watch.
I'm a physicist in a cancer clinic, and I ran the heat math for a human body.
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Every radiation dose, ranked from a banana to Chernobyl.
One of them kills you. Reply with your guess before you watch.
I'm a physicist in a cancer clinic. The biggest number on the list is the one our patients get.
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7 Gy of radiation warms your body by just 0.002 °C. Most people who get it die within weeks.
Our cancer patients get 70 Gy, ten times more, and survive.
Can you guess how before Physics vs You #2?
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Claude wrote all of it in code: the city, the sky, the Earth, the diagram, and the music.
I only checked the numbers.
Why the year gets shorter: in October Earth is falling toward the Sun at 0.5 km/s.
For those 5 seconds nothing pulls it, so it misses 0.5 mm/s of speed. The orbit shrinks by 5 km.
Positions are from an ephemeris for Oct 15, the orbit from a numerical integration.
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Why Venus stays lit: its light takes the long way, Sun to Venus to us. That path is 7 seconds longer, so the gap reaches us after the Sun is already back.
Jupiter blinks 84 minutes after us. Voyager 1 gets the darkness almost a day later.
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If the Sun vanished for 5 seconds, it wouldn't just switch off.
It would go dark from the middle out. The center of the disk is 2.3 light seconds closer to us than the edge.
I checked every number for noon in New York on Oct 15.
One light in that black sky stays on. Why?
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Prompt. I didn't touch the physics code it wrote.
Snowboarder test.
One self-contained HTML file with three.js (ES module from a CDN). A low-poly snowboarder rides down a snowy mountain: two carved turns, then a kicker jump, landing and ride-out. Pine trees, a few wooden chalets, mountains in the distance, soft blue sky.
Third-person chase camera. Square canvas 1080x1080, 20 seconds.
The motion must be physically correct: real gravity, snow friction, air drag, and the rider leaning into turns the way a real rider has to.
For offline rendering, expose window.renderAt(t) that draws the frame at time t seconds deterministically (don't depend on wall-clock time), plus window.rider and window.camera.
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