How Does Television Stone Work?

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[TheActionLab]

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[petergivenbless]

The term "television stone" reminds me of "slow glass"; an idea in a science fiction story, 'The Light of Other Days' (1966) by Bob Shaw, in which there is glass through which light travels so slowly it allows you to see back in time!

[milham]

When you broke the TV stone all I could think was: reminds me of asbestos, hold your breath, don't breathe in the fibers.

[insu_na]

And thanks to vsauce I know the coolest thing this rock can do: show you the sun even through heavy clouds. because the sun's light is parallel there'll be a brighter area visible on the stone when you point it at the sun, than when you point it at any of the diffuse light that the rest of the clouds have

[clytle]

There is a company that fuses a bundle of fiber optic strands, heats them up and stretches the middle, then cuts them at the thin point. After this the polish the ends and it does the same thing, but scales the image. Due to the fact that the light is amplified with the same ratio the image doesn't get dim. No idea if they are still made, but looked like magic

[Dskrib]

"they do *feel* cheaper, and that's because they *are* cheaper"
i lost it

[awogbob]

I appreciate the pace of your videos because their basically always like "Ok yeah but why?" and then you go one layer deeper, and deeper. Always learn a lot watching them.

[capn_shorty]

Imagine a box of Legos made out of this, and needing to walk across the floor after dropping the box.

[DrxSlump]

I'm a design engineer, quite into physics. Most YouTube channels cover things either too basic and known to me or are purely technical but without much fun. You, Sir, manage to amaze me with your amazing little experiments and "magic" materials! Thank you!

[zebfross]

1:25 "They're actually hair-like fibers"
*Smashes asbestos

[WilliamLeeSims]

I've had a chunk of this stone for 25 years. I never once knew about the laser property. Awesome!

[TempleoftheSon]

My brain: why don't we use this stuff for phone screens?

Action lab: (whacks stone with wooden dowel and shatters it into a million pieces)

My brain: "fair enough"

[MintMilk.]

"The sky is falling!"
"It hit me on the head, and it looked like a stop sign!"

[YoungGandalf]

1:30 "Look at this cool rock. Now let's smash it!" 😅

[RILDIGITAL]

Really captivating demonstration of ulexite's optical properties and total internal reflection. It's fascinating how nature has had its own version of a 'fiber optic cable' all along.

[BerzerkaDurk]

In my 13 years working in an optical shop, we never called the angle at which total internal reflection occurs the "critcal angle". We called it the Brewster's Angle, and it is specific to any two adjacent optical media. For super nerds, the angle is equal to arctan(n2/n1), where n2 and n1 are the Indices of Refraction of the outside media and inside media.

[zachhoy]

I'm a nerd and I studied engineering and yet... yet... I always learn so much from your quick and simple lab stuff, so glad you're inspired to share it (I'm sure YouTube revenue helps but I can tell you just genuinely love it)

[nius]

A big unknown: why someone that investigates all these subjects doesn't do the same with the sponsors?

[westonding]

Television stone sounds like a funny name. I wonder why they did not call it a chameleon rock. 😂

[wurlitzerduplex]

Cool stuff. I work with similar but tapered fiber optic blocks to optically couple an x-ray scintillator screen to an array of camera chips. It's pretty amazing the amount of resolution we can get out of such blocks.