Quantum-Locked Superconducting Floating Discs Will Freak You Out

Short version: prepare to have your mind blown by scientastic weirdness (also known as "quantum levitation"). Longer version: exploiting the Meissner effect, scientists from Tel Aviv University (and others) have created an interesting scenario with super-cooled superconducting discs, cooled to -185ºC and suspended above (or below) magnetic fields. Okay, that "longer explanation" still doesn't do it justice. Watch this floating insane-o-disc and prepare to start Googling to see whether it's a hoax:

More mind-blowing video (and some more science mumbo jumbo) after the jump.

A puck zooming around on a magnetic track, accelerated by Hot Wheels motors. At 1:08, a nice Star Wars reference:

And finally, a more complete discussion of the process involved (note that their claim of "frictionless movement" doesn't seem to account for the friction introduced by contact with air; it strikes me as "way less friction than something rolling along the ground," perhaps -- but I'm no Physics major):

And for even more (including commentary by people who actually understand the physics here -- plus some good jokes), check out this MetaFilter thread. Now I'm not saying we're getting jetpacks or levitating cars, but I am saying these videos make me want to grow up to be a scientician.

(Via Gizmodo.)

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Johan Ordonez, Getty Images
This Organization Wants Your Old Eclipse Glasses
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Johan Ordonez, Getty Images

On Monday, August 21, America hosted what may have been the most-viewed solar eclipse in history. While those of us in the United States are still processing the awesome sight, residents of South America and Asia are just starting to look forward to the next total eclipse in 2019—and anyone who still has their protective glasses on hand can help them prepare.

According to Gizmodo, Astronomers Without Borders is accepting donations of used eyewear following Monday’s event. Any glasses they collect will be redistributed to schools across Asia and South America where children can use them to view the world’s next total eclipse in safety.

Astronomers Without Borders is dedicated to making astronomy accessible to people around the world. For this most recent eclipse, they provided 100,000 free glasses to schools, youth community centers, and children's hospitals in the U.S. If you’re willing to contribute to their next effort, hold on to your specs for now—the group plans to the announce the address where you can send them in the near future. Donors who don't have the patience to wait for updates on the group's Facebook page can send glasses immediately to its corporate sponsor, Explore Scientific, at 1010 S. 48th Street, Springdale, Arizona 72762.

Not sure if your glasses are suitable for reuse? Here’s the criteria they should meet for sun-gazing.

[h/t Gizmodo]

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Here's How to Tell If You Damaged Your Eyes Watching the Eclipse
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Amid the total solar eclipse craze, experts repeatedly warned spectators not to watch the rare phenomenon on August 21 with their naked eyes. But if you caught a peek sans glasses, pinhole projector, or protective filter, you may be wondering if your peepers were damaged. (After the sky show, "my eyes hurt" spiked as a Google search, so you’re not alone.)

While the sun doesn’t technically harm your eyes any more than usual during a solar eclipse, it can be easier to gaze at the glowing orb when the moon covers it. And looking directly at the sun—even briefly—can damage a spot in the retina called the fovea, which ensures clear central vision. This leads to a condition called solar retinopathy.

You won’t initially feel any pain if your eyes were damaged, as our retinas don’t have  pain receptors. But according to Live Science, symptoms of solar retinopathy can arise within hours (typically around 12 hours after sun exposure), and can include blurred or distorted vision, light sensitivity, a blind spot in one or both eyes, or changes in the way you see color (a condition called chromatopsia).

These symptoms can improve over several months to a year, but some people may experience lingering problems, like a small blind spot in their field of vision. Others may suffer permanent damage.

That said, if you only looked at the sun for a moment, you’re probably fine. “If you look at it for a second or two, nothing will happen," Jacob Chung, chief of ophthalmology at New Jersey's Englewood Hospital, told USA TODAY. "Five seconds, I'm not sure, but 10 seconds is probably too long, and 20 seconds is definitely too long."

However, if you did gaze at the sun for too long and you believe you may have damaged your eyes, get a professional opinion, stat. “Seeing an optometrist is faster than getting to see an ophthalmologist,” Ralph Chou, a professor emeritus of optometry and vision science at the University of Waterloo, in Ontario, Canada, told NPR. “If there is damage, the optometrist would refer the individual to the ophthalmologist for further assessment and management in any case.”


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