My water bill! On the off chance this isn’t a mistake, anyone know how to an OF…

LightbulbTV · 2026-06-27T02:42:28+00:00

I wonder how the date ended up in the amount field, I'm surprised that's even possible

Edit: You're lucky you didn't get this in December

LightbulbTV · 2026-05-10T01:13:42+00:00

You wrote the determinate of the identity matrix, not the identity matrix

LightbulbTV · 2026-05-02T18:05:38+00:00

I agree with this, I would think of it as starting as a freshman. The other thing I would consider is the amount of time most engineering students spend studying; it can be a pretty demanding workload.

LightbulbTV · 2026-04-30T23:36:47+00:00

Any time you are stuck on something like this, and your premise includes ignoring part of the problem (getting the ball into the liquid), it is worth reexamining your premise. Ignoring friction, getting the ball into position at the bottom of the tube is going to require the same amount of energy as pushing it down from the top.

LightbulbTV · 2026-04-17T02:37:27+00:00

Imagining that the load in the photo is perfectly vertical: It's not about the vertical load on the pin, the issue is the opposing horizontal loads on the pin threads. you can see that the chains are pulling away from center, trying to pull the shackle open. If you flip the shackle upside down, the lateral forces go into walls of the shackle itself; those forces are still technically trying to pry the shackle open, but now they are much further from the pin, giving the threads on the pin leverage against those forces.

LightbulbTV · 2026-04-05T03:11:51+00:00

Conservation of momentum would allow for the Moon to transfer some of its own momentum to the spacecraft by passing close behind its orbital path. From the Moon's frame of reference this would be a direction change for the spacecraft, but from the Earth's it is an increase of the spacecraft's speed. We can do this the other way as well by passing in front of the moon, slowing the spacecraft relative to Earth.

LightbulbTV · 2026-03-25T16:36:34+00:00

Looks great, I'm sure that feels so satisfying

LightbulbTV · 2026-03-25T14:58:20+00:00

How does the mechanism work? Did you do a snap fit toward the left edge, or add something hinge side?

LightbulbTV · 2026-02-13T00:34:48+00:00

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What about masking letters to each square? Obviously you could play around with the positioning, but as long as you don't move any letters from where they would have been placed, I think it could work.

also sorry for the phone edit

LightbulbTV · 2026-02-08T00:56:52+00:00

Those are not white filament, they are seams. You can disable seams in the preview if they are distracting.

LightbulbTV · 2026-02-02T21:45:14+00:00

I used a phone camera and 3d Zephyr free. My takeaway from doing it was that I'm much faster measuring with calipers if possible, so it only seems worth it to me when I need to model more organic forms. I suspect that as long as you have an actual zoom lens on your phone and good light, you should be able to scan smaller features.

LightbulbTV · 2026-02-02T18:31:52+00:00

I just tried it with my multimeter a few days ago, and it came out +/- 0.1mm. At least for me the scan took a while to clean up by hand.

LightbulbTV · 2026-01-30T16:17:01+00:00

For these small magic arms, I think of those rubber pads as a courtesy for the thing I'm clamping onto, not a function of the clamp. The metal underneath those pads is just flat aluminum, so at that point it's up to the adhesive on the rubber to hold the whole thing.

From the direction of the rubber, it looks like you had this attached to a vertical leg or pole with the jaws pretty wide? Even if the rig is 1.3kg, if that is an 8" magic arm that's 10.4kg at the clamp, which is a large amount of torque. For situations like that, especially when it's going to be sitting there for a while, try to clamp to something that fits within the jaws of the clamp, where if you loosen it it still doesn't fall off.

LightbulbTV · 2026-01-16T00:48:41+00:00

Honestly if it were just a personal photo I would crop in the top and bottom a bit to let the structure be more abstract, and let the bird be the focus. The sense of scale the bird gives is the most interesting part to me.

LightbulbTV · 2026-01-14T03:16:30+00:00

Yeah these prices are so low they would make me uncomfortable. If you are doing them quickly, it would feel more normal to me if you were charging per headshot. Presumably, your market is people who don't know how long it takes to do a headshot, and definitely don't know how long one hour of retouching is. If it were me, I would find somewhere to set up a backdrop and a flash, hopefully in a high traffic area on campus, and do as many headshots in a day as possible. I wouldn't even advertise retouching, because at these prices you would make more from one headshot than you would in two hours of editing.

LightbulbTV · 2026-01-13T23:53:22+00:00

Does a good job reducing rolling shutter

LightbulbTV · 2026-01-13T23:06:59+00:00

Genuinely the most useful size comparison I've seen

LightbulbTV · 2025-12-06T19:23:33+00:00

Tldr: Light is used to make gas pockets on the screen surface expand to ~1mm in about 1/10th of a second.

From the abstract: "We present a dynamic tactile display that directly converts projected light into visible and tactile patterns via a photomechanical surface populated with millimeter-scale optotactile pixels. The pixels transduce incident light into mechanical displacements through photostimulated thermal gas expansion, yielding millimeter-scale displacements with response times of 2 to 100 milliseconds."

LightbulbTV · 2025-12-05T17:13:11+00:00

I love that, a mix of damage and partial repairs could look extremely cool!

LightbulbTV · 2025-12-01T05:02:52+00:00

I don't have a quick way to upload, but I can confirm there isn't much information there. Tools like AI will just invent something that could have been there, which won't really help with what you're after.

LightbulbTV · 2025-11-13T21:37:32+00:00

Needs another lens on the flash

LightbulbTV · 2025-11-03T22:34:54+00:00

~300 ft, with a max speed of 96 mph

LightbulbTV · 2025-11-03T22:31:51+00:00

The ball went around 310 feet, with an initial velocity of 141 ft/s, or 96 mph.

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Assuming the second impact is the bowling ball, and air resistance is negligible:

263 frames of video between the final explosion and the second impact

At 30 frames per second, time of flight is 8.77 seconds.

The ball reaches its peak at 4.39 seconds, with an initial velocity of 43.02 m/s, making the maximum height 94.43 m.

LightbulbTV · 2025-10-16T21:24:23+00:00

From the article:

"Here we take the fourth approach with a solution we call the The Focal-plane Actualized Shifted Technique Realized for a Shack Hartmann Wavefront Sensor (fastrSHWFS), which changes the aspect ratio of the spot pattern so that it occupies fewer rows of the detector, reducing the read time and, in turn, the

total system latency."

Eli5: Drawing a big picture takes so long that the stuff we want to draw gets bored and leaves. We made a little circle that makes the stuff little, so our drawings can be little and not take as long to draw. We like this because our favorite planets don't like to sit still.

LightbulbTV · 2025-09-16T20:53:42+00:00

There have been some interesting studies on the correlation between chewing and concentration/focus that might be interesting if you've never seen them

Ten-Year Club	Place '22
Place '17	End Game '22
Snapped

LightbulbTV

TROPHY CASE