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How Uv Causes Cancer And Aging | Welding In Space - At Up-Tube.com

How UV Causes Cancer and Aging Welding in Space 1 day ago   04:46

Veritasium
UV at ground level is non-ionizing but it damages DNA and causes photoaging - how?
Also, it turns out glass doesn't block all UV (specifically UVA passes through). This is something I learned filming with the UV camera inside.

Special thanks to Dr. Hayley Golbach, @hayleysgold on twitter
https://twitter.com/hayleysgold

Ultraviolet light causes damage to DNA, leads to cancer and photoaging: age spots and wrinkles. I was curious about this because UV is technically non-ionizing. A photon of UV doesn't have enough energy to strip an electron off atoms or molecules. However it does have enough energy to trigger photo-chemical reactions. For example, it causes pyrimidine dimers - the unauthorized covalent bonding of adjacent thymine or cytosine bases in our DNA. If these spots are not properly repaired, they may lead to mutations and cancer. Photoaging is typically the result of degradation of collagen and elastin fibers - scaffolding that supports the skin. This leads to wrinkles and saggy-looking skin.

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

Support Veritasium on Patreon: http://ve42.co/patreon

Music from Epidemic Sound http://epidemicsound.com "Serene Story 2"

Comments 1298 Comments

Nick MaGrick
the whole universe is trying to constantly kill you, even the stuff that keeps you alive

But I am a little confused, they didn't talk at all about how the sun is necessary for your health still. Or what the best balance between exposure and protection is, or what it even might be. So pretty disappointing yours just telling people what they already know. Sun exposure causes skin cancer, I think we knew that before we knew what cancer was.
UHFStation1
What about UVB? It causes sun burns in high amounts, but is needed for enough good vitamin D. What about the effects of infrared? There are studies that suggest it can help skin heal with less scaring etc.
As Vet
That's why I look so young, I never go outside.
Rafi Ashraf
Genuinely thought I was watching an ad at the start. No joke.
None of your business
you take me for the ass
enticeman28
Is this proof that we are actually not from around here? We haven't evolved to cope with this star.
Ahmed Almujaberchi
Doesnt the benefits outwiegh the problems that are mentiond in the video from UV-light. Our body knows how to take care of that kind of damage. Right?
CD Music
Old people have perfect butts. Deep.
49metal
So, can this effect manifest at certain concentrations of longer EM wavelengths, like visible light and, you know, radio?
(Asking for a friend.)
Kelly Mcgrath
thymine thymine dimers
Abinash Sarma
Sunscreen is called sunscreen because it's a sunscreen....
Markus Auer
Yeah but its also very helpfull you can kill every bakterie/virus with it. Its used to desinfekt water and kill every bakterie. Bakterias cant protect them from uv light.
Jim Johnson
We need sunshine, GO OUTSIDE AND GET ATLEAST 1 HOUR PER DAY WITH NO SUNSCREEN
C C
It puts the sunscreen on it's skin, or else it gets the hose again.
inGods2hands
Windshield protects 94% UV A B but side windows only block 40%. 3M crystalline blocks heat, glare and UV. Don't hesitate, no one wants skin cancer, have the 3M crystalline film put on the side windows of your car.
Puppetboy Miguel
Hey Veritasium, "ha, ha, ha, ha, ha"
I love this intensifying aging. It is really normal!
D Kahn
Now he needs to do a video on the chemicals in sunscreen that are bad for you.
D Kahn
Everything has it's positives and negatives.
Clark Engelbert
This information is pure garbage. UV light is critical for health. Google Dr. Jack Kruse.
Econael
People don't get enough Vitamin D.
They should use less sunscreen, not more.
Add Reply

Welding in Space How UV Causes Cancer and Aging 1 day ago   03:09

In space, metals can weld together without heat or melting.
Check out Audible: http://bit.ly/AudibleVe
Support Veritasium on Patreon: http://bit.ly/VePatreon

Written by Joh Howes and Derek Muller

Yes, it's pronounced Gemini (ee not eye) because that's the way everyone pronounced this mission.

Thanks to Patreon supporters:
Bryan Baker, Donal Botkin, Tony Fadell, Saeed Alghamdi

References:
Gemini IV transcripts: http://www.jsc.nasa.gov/history/mission_trans/gemini4.htm

Gemini IV recordings:
https://archive.org/details/Gemini4 (relevant clip is 1297 at about 2:00)

ESA cold welding recommendations:
esmat.esa.int/Publications/Published_papers/STM-279.pdf

Cold welding gold nanowire:
http://www.nature.com/nnano/journal/v5/n3/full/nnano.2010.4.html

Music by Kevin MacLeod "Intrepid" http://www.incompetech.com