The World in UV Electromagnetic Levitation Quadcopter 5 months ago   11:13

UV cameras expose a hidden world and reveal the incompleteness of our perception
The Physics Girl looks at sunscreen:
How to make sunscreen from scratch:

In summary, ultraviolet light interacts differently with matter for a number of reasons:
1. Some pigments selectively absorb UV so they may appear white in the visible but dark in the UV. The pigments usually dissipate the UV energy as heat, though the breaking of bonds can also occur.
2. Fluorescent molecules absorb UV light and re-radiate that energy as visible light. This makes them look dark in the UV but glowing under black light.
3. Ultraviolet light scatters more than visible light because the wavelength is shorter and Raleigh scattering is proportional to the reciprocal of wavelength to the power of four.

Special thanks to HHMI BioInteractive for their awesome animations of melanocytes and how the melanin in melanosomes protect your DNA. To see the full video explaining how we get our skin color, check out:

Special thanks to Patreon supporters:
Donal Botkin, Michael Krugman, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen, Yildiz Kabaran, Terrance Snow, Stan Presolski


Overview of main UV effects:
Visualizing Rayleigh Scattering through UV Photography

Arctic animals are photographed in the UV to increase visibility and get an accurate count:
Lavigne, D. (1976). Counting Harp Seals with ultra-violet photography. Polar Record, 18(114), 269-277. doi:10.1017/S0032247400000310

Absorption spectrum of melanin:

"The spectroscopy of human melanin pigmentation," by N. Kollias. In: Melanin: Its Role in Human Photoprotection, pp. 31 - 38. Valdenmar Publishing Co. (1995).

"Optical properties of human sclera, and their consequences for transscleral laser applications," by A. Vogel, C. Dlugos, and R. Nuffer, Lasers in Surgery and Medicine 11(4), pp. 331 - 340 (1991).

"The incidence and time-course of latanoprost-induced iridial pigmentation as a function of eye color," by P. Wistrand, J. Stjernschantz, and K. Olsson, Survey of Ophthalmology 41(S2), pp. S129 - S138 (1997).

Music by Epidemic Sound: "Spring Moods 5"

Comments 4021 Comments

Thompson L
Now I'm always gonna see his two front teeth whiter than the rest
cow moo
So this is what kaminoans see?
do the world in infrared!
ben creighton
the first thing I noticed was that his skin and hair was black in UV, when they were opposite colours before
Nick İsim
In the UV spectrum, he is more handsome.
Oh get a room
I don't get how his two teeth look different at the beginning but as soon as that clip ends they are normal again??
Tony Bucca
Wonderful? monochrome? hazy? No thanks
AA Productions
Does _IR-Light,_ on the other hand, go right through sunglasses like it's clear?
AA Productions
Is it better to reflect it or absorb it?
John Remie Evensen
Just wondering are you colorblind or something? its clearly darkgreen, not freek'in black dud :D hehehehe
Social Network
wish my ancestors would have just stayed in england. My parents sucked and never taught us about the sun or sunscreen. I got 2nd degree burns twice when i was a kid, regularly got first degree burns. Now that I am older i have freckles all over my back, nothing cancerous, yet, but they are weird. Some of them are halo moles. My nose got burned really bad too and that actually does have squamous cell carcinoma but not progressing, so i just have to watch it. Fuckin sucks. uhg... wish everyone could have good parents. My parents were dumb hillbillies. Had to learn everything myself. But this lesson was too late, the damage has already been done.
Philippe Nachtergal
8:50 Uh, doesn't that graph state that Oxygen and Ozone absorb pretty much everything in the deep UV ?
Paper Mario
I would’ve liked to see what black skin looks like in UV but oh well..... 😑
Gan Guryu
Could you make Glasses that would see through the "Blue Haze" of the sky and that would let to see space directly?
Brabus 76
Ask Riddick!
eric wallace
2:28 me after I orgasm
So the sunscreen transfers uv into heat... will my face then get warmer more easily in the sun with sunscreen than without? (not regarding burning)
Logan Penzkover
It's called turning your render distance down and turning on fog.
Niko Jehkonen
shouldn't the world in UV have more demons and such, since Ultra-Violence difficulty makes it so?
Add Reply

Electromagnetic Levitation Quadcopter The World in UV 5 months ago   06:19

Spinning magnets near copper sheets create levitation!
Try Audible free for 30 days:
Special thanks to Hyperloop One for showing me around.

Thanks to Patreon supporters:
Nathan Hansen, Donal Botkin, Tony Fadell, Saeed Alghamdi, Zach Mueller, Ron Neal, Perry cl, Bryan Baker
Support Veritasium on Patreon:

Filmed by Raquel Nuno, Edited by Trevor Carlee

Obviously this "quadcopter" is a demonstration device, showing how moving magnets over a conducting surface can generate levitation. It has not been optimized to minimize losses or be an efficient mode of transport. I still think it's pretty cool. I'm used to seeing light things levitated by induced currents but not a 100+ lb machine.

For more on Hyperloop One: