Search results for query: *

TIL that the wire wheel (e.g. as used in bicycles) was invented by none other than 19th century aviation pioneer George Cayley. https://en.m.wikipedia.org/wiki/Wire_wheel

This unusual sheet metal is made of hundreds of nano scale layers of aluminum and nickel. A spark initiates a self-propagating reaction that creates NiAl co...

There has been a new burst of interest in this from the popular media, for example: https://www.telegraph.co.uk/news/2023/05/27/electricity-thin-air-cloud-lightning-clean-energy-machine/ https://newatlas.com/energy/lightning-like-energy-from-air/

No Country for Ground Hogs.

And how many full moons did they find?

This led me to wonder how many people here have exam dreams, maybe even years or decades after they last had to sit an exam? Share your wierd or amusing exam dreams here! Apart from the actual exam itself, I often dream that I am enrolled for some course with an exam looming soon. My class...

TIL that people used to drill a hole in the top of an integrated circuit package in certain Microsoft gaming devices in order to defeat anti-piracy features. Essentially, hacking right into the silicon.

Welcome to Micromouse, the fastest maze-solving competition on Earth.

I remember a cartoon where an electrician is working on an open junction box next to an electric chair. He's just turned to the prisoner and is asking anxiously, "Feel anything yet?"

One of the pre-iron-age Egyptian pharaohs had, among the paraphernalia that he was buried with, an iron dagger made from meteoric iron. Edit: In fact it was Tutankhamen : https://en.m.wikipedia.org/wiki/Tutankhamun%27s_meteoric_iron_dagger

I used to think it was a pony brake. I mean, it does make sense that you would measure horsepower on a pony brake. Edit: Maybe use a pony to calibrate it?

“You lose your phone again, Rusty?”

Why are there two pairs of spike heeled shoes on the floor in the first cartoon? Edit: Never mind, I just got it :smile:

TIL how some people use molten lead to clear invasive insect colonies Edit: It's aluminium, actually.

Charles Parsons designed a superior steam engine called a turbine, but was ignored until he crashed a celebration of Queen Victoria's Diamond Jubilee...

Interesting that the next human's pronoun is "it".

https://phdcomics.com/comics/archive.php?comicid=2051

As is often the case on this thread, it took me a few seconds to get it.

Yes, it is.

So if I slowly and carefully dribble some disinfectant-laced water onto the top of the evaporator, it will find its way into the drain pan and not damage other things, and not drip out of the air outlet?

That is exactly my point. My question is not about re-evaporation of this dripping water (which is what your reply addresses, if I understand correctly). My question is about mechanical transport of the dripping water, impelled by the blower, into the room. What prevents this?

My AC has begun to emit a rather foul smell, which has led me to geek out on the inner workings of its indoor section. For example, how does the condensed moisture make its way to the drain pan? I am assuming that the condensation happens on the fins of the evaporator. But in that case, what...

I Bleve it was.

Please share your experience if you have used inkjet technology for very occasional printing. E.g. could a modern cartridge / ink tank work well if it is consumed over one year, say?

Just off the top of my head, not actually calculating anything, I would have guessed a time scale of years.

In Windows, I have been using a "Samsung ML-1660 Series Class Driver", and it works. See pic in my first post. (My actual printer is ML-1666, which I have been assuming is of the "1660 series class". After much digging and trial & error, I found that this logic doesn't cut it on the Raspberry...

I tried to use Wolfram to send data from the print file (created as described above) to the usb printer hosted on the WiFi router: ip = "192.168.1.1:9100" port = "TCP" socket = SocketConnect[ip, port] data = BinaryReadList["/home/pi/Desktop/printerFile/printerFile.out"] BinaryWrite[socket...

A bit of progress... You have to use the CUPS service to set up printers on the Raspberry Pi. It has a web based interface at localhost:631. When I went through the "add printer" wizard, I found that it supports a range of Samsung printers, including mine (ML-1660). But when I print a test...

A couple of years ago, I connected a USB printer to the USB socket on my broadband router. After a lot of trial and error (of which I remember no details) I was able to print from my windows laptop. Here are the port settings that currently work from the laptop: 1) Based on the above...

When you export a WhatsApp chat to, say a folder on your Google Drive, you get a text file plus a lot of media files. It would have been an easy job for the developers to create an HTML file instead, with IMG tags that would populate all the images into the right places. That would have been...

It doesn't show any error, but silently fails to create any backup file. A google search turned up some suggestions that this could be due to permission issues. I could finally do the backup/restore via Google Drive, so I'm good now. (I wanted to have a local backup just in case drive didn't...

When I look at the permissions settings for Whatsapp on my Android phone, I see these options: * Allow access to media only * Deny Now, I want to allow access to all files, not just media, because without that WhatsApp is not able to create local backup files. I do see that some apps like...

The article has a very long, rambling and repetitive preamble that almost turned me away. But finally he gets to a list of banned use cases. Many of these are obvious, but as the author points out, it would be possible to fall foul of them unintentionally because of the unpredictable nature of...

Today i learned that forces acting on the bones produce piezoelectric effects, which then play some important physiological roles. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8615512/

So this vendor, at least, doesn't recommend using the thing for exhalation exercises. Some youtubers are demonstrating that, which would perhaps be misleading at best and harmful at worst.

I have watched a few videos about how to use a 3 ball incentive spirometer for lung rehabilitation. Most of them are about inhalation, which you exercise with the device held right side up. I also saw a couple of videos where they hold the device upside down to test and strengthen exhalation...

Fun fact: The company was first named Takachiho Seisakusho. Takachiho is a mountain that Japanese gods live on, according to Japanese mythology. They introduced the brand Olympus (after the mythical Greek mountain & home to the Greek gods) in 1921. During the war years they went back to the name...

Today's video shows you how to produce your own graphene which should only be done very carefully and with previous experience.

TIL that "orphaned" oil wells are a thing. A very bad thing.

The consequence of spin is an extra magnetic deflection quite apart from the one you are referring to. That extra deflection is a function of the non-uniformity of the magnetic field, and is at right angles to the standard one that classical physics predicts. For example, an electron will move...

Sorry, that was sloppy language. I meant big-O applied to some f(x) that involves something raised to ##\epsilon##

Thanks. Another quick question: When we read "for ##\epsilon>0## ", does it imply ##\epsilon<1## even if that's not stated? I mean specifically when talking about big-O to the power of ##\epsilon## ?.

I don't have a subscription either. If you scroll down, you can read it (embedded in the same page). It says, << means "much less than" ... that's familiar, but what about the subscript?

What does this mean: ##f(t) \ll_\epsilon (g(t))^\epsilon## ? Ref: Beginning of the introduction here.

. Not strictly as per OP's spec, but interesting: .

As others have stressed, the problem is not the weight of the wings. The problem is that if you want to fly by flapping a pair of wings (even weightless wings), you have to keep a lot of air moving pretty fast in order to get the lift you need. This takes a certain amount of power, and the...

We crossed a dolphin with a cow, and THIS happened... www.youtube.com/watch?v=e8wkplOPqcs

Emmy Noether ?