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#HuhThatsWeird

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Huh, that's weird...<p>I found these weird &quot;upcicles&quot; growing out of chain link fence posts near Lechmere in <a href="https://cybersecurity.theater/tags/CambridgeMA" class="mention hashtag" rel="tag">#<span>CambridgeMA</span></a>! I&#39;ve seen them a few times, and they&#39;re *super funky*.</p><p>How the heck do these form? Are they in fact a large version of the ice spikes that sometimes form on ice cubes?</p><p>See thread for more details.</p><p>Unfiltered gallery: <a href="https://gallery.brainonfire.net/v2/list?tt=Location=Bike%20path%20along%20western%20Morgan%20Ave,%20Cambridge,%20MA&amp;tt=Content=ice&amp;tt=Content=mystery&amp;mode=raw" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://</span><span class="ellipsis">gallery.brainonfire.net/v2/lis</span><span class="invisible">t?tt=Location=Bike%20path%20along%20western%20Morgan%20Ave,%20Cambridge,%20MA&amp;tt=Content=ice&amp;tt=Content=mystery&amp;mode=raw</span></a></p><p><a href="https://cybersecurity.theater/tags/HuhThatsWeird" class="mention hashtag" rel="tag">#<span>HuhThatsWeird</span></a> <a href="https://cybersecurity.theater/tags/ice" class="mention hashtag" rel="tag">#<span>ice</span></a> <a href="https://cybersecurity.theater/tags/physics" class="mention hashtag" rel="tag">#<span>physics</span></a></p>
Huh, that's weird...<p>I was playing around with a diffraction grating (a child&#39;s toy, &quot;rainbow glasses&quot;) and decided to look at some LEDs to see if I could tell how smooth or bumpy their spectral output was—I&#39;d heard that cheaper white LEDs tend to have a sharp peak in the blue and a large, wide peak around green/red.</p><p>And that&#39;s what I saw: A dim region between blue and green. But it&#39;s also *narrower* there, which I didn&#39;t expect! Maybe there&#39;s some diffusion of the light transversely?</p><p><a href="https://cybersecurity.theater/tags/HuhThatsWeird" class="mention hashtag" rel="tag">#<span>HuhThatsWeird</span></a></p>
Huh, that's weird...<p>I want you to do an experiment, if you can.</p><p>Find a bright background (daytime sky, very brightly lit wall). Make a pinching motion right in front of your eye so you can just barely see the background past it—and focus your eye on the background.</p><p>Just as your fingers are a hairs-breadth apart... do you see a bridge of shadow between them?</p><p>- What does it look like?<br />- Does your camera see the same thing?<br />- Why the heck is it there?</p><p><a href="https://cybersecurity.theater/tags/HuhThatsWeird" class="mention hashtag" rel="tag">#<span>HuhThatsWeird</span></a></p>
Huh, that's weird...<p>🧠 That bike that passed us, playing music on a speaker—the pitch went from high to low! Doppler effect!<br />🧑‍🔬 Yeah, very good, self! Good noticing.<br />🧠 And when you slow music down, the pitch gets lower.<br />🧑‍🔬 Sure... where are you going with this?<br />🧠 Red shift from stars is Doppler shift too and it&#39;s from time dilation! Bikes must move at a significant fraction of light speed!<br />🧑‍🔬 why do you do this</p><p>----</p><p>I *know* it&#39;s wrong, but now I need to go on a Wikipedia binge to figure out why. &gt;_&lt;</p><p><a href="https://cybersecurity.theater/tags/HuhThatsWeird" class="mention hashtag" rel="tag">#<span>HuhThatsWeird</span></a></p>
Huh, that's weird...<p>Somehow the stove can turn my kitchen scale on!</p><p>I had the scale powered off and sitting to one side, and when I turned on a different burner, the scale powered on. Is this inductive coupling?</p><p>(All the burners spark at the same, so it doesn&#39;t matter which knob I turn.)</p><p>What&#39;s even weirder is that this morning I *couldn&#39;t* reproduce it after cleaning the stove. It only worked again just now. Maybe it had to dry out.</p><p><a href="https://cybersecurity.theater/tags/HuhThatsWeird" class="mention hashtag" rel="tag">#<span>HuhThatsWeird</span></a> <a href="https://cybersecurity.theater/tags/physics" class="mention hashtag" rel="tag">#<span>physics</span></a> <a href="https://cybersecurity.theater/tags/electronics" class="mention hashtag" rel="tag">#<span>electronics</span></a></p>
Huh, that's weird...<p>When I press on this fidget spinner, the noise gets louder and higher pitched. But when I drag it across the surface, the opposite happens.</p><p>Seems to happen on any resonant surface, like a wooden desk top or (here) the lid of a washing machine.</p><p>Why does the sound change?</p><p>(May require headphones, but turn the volume down first!)</p><p><a href="https://cybersecurity.theater/tags/HuhThatsWeird" class="mention hashtag" rel="tag">#<span>HuhThatsWeird</span></a> <a href="https://cybersecurity.theater/tags/physics" class="mention hashtag" rel="tag">#<span>physics</span></a></p>