I broke a wine glass with my voice (2018) [video] | Hacker News Reader

I broke a wine glass with my voice (2018) [video]

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135 pointsBrajeshwar45 comments

Dianna (Physics Girl) is currently experiencing severe complications from ME/CFS/long COVID. Per the last update on her twitter:

    The last weeks were scary. ER visits were hard. Dianna 
    still can’t walk, or even sit up in bed. But we see signs
    of progress. Sleeping more. Eating more. More treatments coming.

Update here - https://www.youtube.com/watch?v=vydgkCCXbTA

https://twitter.com/thephysicsgirl

I almost cried when I saw that video.

The same way I watched science programs as a kid, then, as an adult, I'd say that I watched science videos with her, alongside other YT channels.

Becoming a Patreon is the least I can do as someone on the other side of the world. I hope she can overcome long Covid and start her recovery soon.

I had a good friend go through the same complications (they're back to ~80% at this point, six months later). Watching that video was an eerily familiar experience...

Long covid researchers-- is the current body of research converging on any cause(s) for the myriad long covid symptoms? Endothelial damage?

Terrifying disease.

I did this with Python and Pygame a ways back, and was also inspired by Mike Boyd. The code and an STL to focus a speaker are linked in a repo: https://www.makeartwithpython.com/blog/break-glass-with-reso...

cool trick. Great channel. Mike's is also very high quality entertainment.

Here's hoping Diana recovers from her ME/CFS swiftly.

It's not something you recover quickly from :(

https://www.patreon.com/physicsgirl to help her recovery.

Dunno if true, but resonance frequency is the reason German military always avoided making goose step military marches across bridges. I suppose it would depends on the bridge anyway... But would have been fun to watch.

Breaking stride on bridges has been known to (some) militaries since the Roman times iirc.

Mythbusters did an episode on this! I totally cannot remember what they concluded

They did and if I remember correctly they concluded it was busted. I remember this episode in particular because I didn’t feel like their tests were completely sound and didn’t accurately model a civil engineered life-size bridge so at best the result should have been inconclusive.

It was later re-tested and re-classified as plausible (for some reasons the particualr episode was aired in EU but not in the US):

https://en.wikipedia.org/wiki/MythBusters_(2004_season)#Epis...

The machines they built to simulate the marching was entirely inadequate. A much better way to test it would've been a weight on a voice coil, and a contact microphone to monitor echoes. They'd still probably be unable to tear down the bridge model they built, as that thing seemed to be way overbuilt.

I've heard that back in the day conservatories would use this as part of their entrance exam. It is a great way to test if someone can recreate a specific pitch by ear.

I wonder what percentage of the failures to recreate a pitch are due to people not being able to adjust for the difference when they're hearing it through their own skull.

I'm going to go with 0%, given that the fundamental pitch of a sound is unaffected by material interference. I suppose exceptionally high-pitched tones above several thousand hertz might be affected, but nothing within the range of a human voice.

The human throat cannot produce a completely pure tone. The bones and tissues of the skull do not resonate perfectly with all harmonics, resonating more strongly with the lower harmonics. This magnification of lower harmonics distorts the perceived tone of sound coming from inside the head.

Nothing about that is going to make the fundamental pitch of a sound you hear seem like a different frequency than it is. It will affect your perception of the complex overtones as you say, but matching the fundamental frequency you're singing with the resonant frequency of the glass does not involve complex overtones.

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