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Everything posted by Sensei
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The easiest way to get the best score for this project is to use a 3D printer to make air gaps and connections between different layers. Make a project, print, measure the time it's cool. Make the 2nd project, print, measure the time it is cool. Make the 3rd project, print, measure the time it is cool. etc. Pick up the best project to show to teachers. Experiment with different filaments such as PLA, ABS, ASA, PETG, TPU, etc. and different 3D printing techniques. Create a precise spreadsheet to show the results.
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Science is like Lego. One piece rests on top of another piece in the right place. When you start discarding something that's really on the bottom, nothing fits on top anymore. Funnily enough, these people ("flat-Earthers") use the Internet and cell phones, which are based on the top few percent.. Flat-earthers cannot live in either Japan, the US or Hawaii. Simply pinging Japan from the U.S. or Hawaii, or vice versa, yields something that completely does not fit their theory. The latency of pings is correlated with the distance the data has to travel in both directions. Such delay is used to triangulate a person, vehicle, etc. So, when you know that Japan has a small ping to Korea, and Korea has a small ping to China, and China has a small ping to India, and India has a small ping to Pakistan, then to Saudi Arabia, Israel, then to Turkey, and then to Europe, you can indirectly measure distances by simply measuring the ping latency from thousands of connections. On a flat Earth, is Japan close to the US? In spherical Earth, data can go through the Pacific ocean, or through satellites, or through entire Asia (which is easy to detect as it is longer distance to the West US).. What flat-earthers have instead? Tokyo-Los Angeles is 8814 km in "straight" line https://www.google.com/search?client=firefox-b-e&q=tokyo+los+angeles+distance while to Madrid there is 9356 km https://www.google.com/search?client=firefox-b-e&q=madrid+los+angeles+distance (plus all the rest through Europe-Middle East-Asia).
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On a flat Earth, there would be no day and night cycles and no time zones with different time according to altitude and longitude, nor would there be different seasons.. There would be no polar night and polar day, and no aurora borealis. The poles only make sense on spherical objects anyway. On a flat Earth, distance from lat1,long1 to lat2,long1 would be the same as from lat1,long2 to lat2,long2 and making a perfect rectangle or eventually square.
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With ChatGPT v3.5, you can ask the same question in two different ways or in two different languages and get completely different answers.. The result is completely unreliable and even dangerous if one is not aware of how it works, and believes everything without any doubt (like the typical people using it)..
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For an atheist, none. The atheist lives in the here and now and does not ask transcendental questions.,
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Obviously. If you are omniscient, or the creator of the Universe.
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When a skyscraper is built, in some projects, mostly in developed countries, nets are installed every few floors to catch falling builders (Building Safety Regulations etc).. Once construction is complete, the nets are removed. Nowadays, windows in skyscrapers are often designed in such a way that they cannot be opened or broken, to prevent people from committing suicide by breaking them and jumping out. If someone wants to commit suicide, they will find a way around anyway..
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..as almost every war shows, human life is almost worthless to politicians..
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If it is several LEDs in one bulb, you can see which one has failed, as they are often dark/black upon close inspection.
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..price.. ? ..quality.. ?
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The oxidation layer acts as an insulator, increasing energy consumption. So it is better not to have it than to have it.
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I would start by checking whether the spotlights are connected in parallel or in series. If one is flashing and they are in parallel, it is most likely a defective or defective-to-be spotlight or the wires going to it, otherwise all spotlights would flash, isn't? If you have (doubtful) a lab power supply where you can regulate the voltage and maximum current and observe what is really being drawn, this would be much easier. It is an essential device for electronics engineers. The cheapest brand new Chinese I can find here is for $60. Just plug a spotlight into it and start at 0A and go from there. You would see if there is flashing or not. You can replace places of spotlight which flashes with the one which is not and vice versa, to see if there is a change. Is there any important information missing in the OP? Did you use halogen bulbs and then replaced them by LEDs? Otherwise the above statement makes no sense.. LEDs should be powered from designed for them switched-mode power supply and halogens should be powered from designed for them power supply. Some LEDs require constant current power supply. https://www.google.com/search?q=led+constant+current+power+supply You dim LEDs by PWM, Pulse-Width-Modulation. https://en.wikipedia.org/wiki/Pulse-width_modulation https://www.google.com/search?q=pulse+width+modulation+led+brightness+control (which is a different technique from voltage or current regulation) ..or maybe there is an oxidizing layer between the socket and the LED bulb.. Try an acid, such as acetic acid, to remove the oxidation layer, then clean with isopropanol (IPA).
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can I find out when a drive was last connected or accessed?
Sensei replied to kenny1999's topic in Computer Help
This is the most reliable way to prevent unauthorized access to files you do not want to share with others. I already said - it depends on the operating system and the file system used. Windows OS has functions SetFileTime. Read the docs. https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-setfiletime and GetFileTime https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfiletime From the user's perspective, RMB on the file and use Properties, and you will have there the timestamps of creation time, last write and last access. "not able to be trusted or believed" https://dictionary.cambridge.org/uk/dictionary/english/unreliable i.e., it can be easily faked. If someone connects your disk to Linux, you will have nothing.. i.e. you will have the misconception that it has not been read. I clicked RMB on some files on VBox with Win10, opened the Properties window and now I see that it caused an update of the last access time.. -
can I find out when a drive was last connected or accessed?
Sensei replied to kenny1999's topic in Computer Help
There is a flash drive with a built-in keypad where you have to enter a PIN code to access it. https://www.ebay.com/itm/395407083462 so, unauthorized person will have difficulty at accessing it.. If you format a flash drive to ext4 instead of NTFS/FAT32/exFAT, it will not be accessible from a standard Windows OS, only from Linux. There are data encryption programs, which you might use.. 7zip and zip have built-in encryption algorithms. -
can I find out when a drive was last connected or accessed?
Sensei replied to kenny1999's topic in Computer Help
It depends on how it was connected to the computer, file system on drive, and which operating system you are using.. If the device was connected with your consent via a USB adapter and it is Windows the information about connected USB devices can be in HKEY_LOCAL_MACHINE / SYSTEM / CurrentControlSet / Enum / USBSTOR. https://www.cybrary.it/blog/usb-forensics-find-the-history-of-every-connected-usb-device-on-your-computer ps. Generally unreliable. Easy to fake if somebody has some malicious purpose. Some file systems store information about when a file was created, modified and last accessed. -
Which way of calling someone is more anonymous?
Sensei replied to kenny1999's topic in Other Sciences
GSM is an outdated and flawed protocol. You can pretend to be another number, any number.. https://duckduckgo.com/?q=gsm+spoof Check this procedure: https://smartphones.gadgethacks.com/how-to/make-spoofed-calls-using-any-phone-number-you-want-right-from-your-smartphone-0242383/ The apps you need for this are in the Apple Store and Google Play Store (and seem to have pretty good rankings). Try it out and tell us how/whether it works. I didn't use the phone for calling for about ten years. And it was just pizzas from third-party devices. -
The most basic equation of gravity does not require any significant knowledge, except the ability to think, measure and calculate. i.e., drop an object from a height d and measure the time it spent flying toward the ground. You get a few samples and derive the equation d=1/2 a t^2. The problem with people is that 1) there was no free public education for all people until the end of the 19th century 2) only a fraction of rich aristocrats (later also rich townsfolks) (a few who could read, write and count) were interested in science. Because of this, for centuries and millennia, there was slow development because they were more interested in their daily lives, and increase of their personal assets, not in the development of science. Nowadays, too, only a small fraction of the population is engaged in science. But because the population is huge, there is the largest absolute number of scientists in the world.
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..a brake on killing and stealing everything from all others.. ?
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People are very selective. They worry about things that have a tiny chance of killing them, and they don't worry about things that will have a huge chance of killing them..
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Mother Nature holds many secrets from Man or does She?
Sensei replied to JohnDBarrow's topic in General Philosophy
..between two electrically charged particles also exists a void.. The solid state of matter is an illusion (human perception of time etc.) that exists only in a state of very low energy. The longest physical experiment has been going on for 97 years: https://en.wikipedia.org/wiki/Pitch_drop_experiment -
From nothing, you can only grow, gaining experience as you go.. without detection the rest is irrelevant.. They are useless if they warn days or weeks before a close flyby of an asteroid hundreds of meters in size. IOW, disallowing for any sensible reaction (which requires years of preparation, or in extremity months) Now you start with nothing. Then you build one, launch, place in orbit, then you build a second, launch, place in orbit, then you build a third, place in orbit.. then you repeat it over and over and over.. Endless work. Some will have problems sooner or later and need to be replaced. "Cloud" is "a dynamically allocated number of resources to meet current demand."
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How many times has a Powerball winner won twice or three or four in a row? You accept the risk every time you leave your apartment. You are more likely to die in a car accident than in any space accident. And you adjust to the most likely possibilities. And you solve them. Man has detected/confirmed one, so far, AFAIK. IOW, rephrasing the question, what if the ejected black hole is on its way toward Earth? You can learn about it with a similar delay as in the case of an ordinary space asteroid, or less. i.e. do you already have a plan against "ejected black holes"? https://science.nasa.gov/missions/hubble/hubble-sees-possible-runaway-black-hole-creating-a-trail-of-stars/ Haven't currently existing telescopes shown their uselessness by failing to detect asteroids flying toward Earth? How many do you need to use cloud in the name? Is 10 a cloud? Is 20 a cloud?
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The simplest defense would be to harvest/mine a potentially dangerous solar system asteroid long before it is on a straight path to Earth, using transport rockets that take off in such a way that they are slightly displaced to another orbit, just because rocket(s) started from it. Most sensible for some metallic/solid asteroids. Mining on the asteroid would also allow nuclear weapons (useless here on Earth) to be placed there, in the core, just in case they are urgently needed before the asteroid is fully depleted but on its way to Earth. The best time to blow up such an asteroid is when it is on the other side of the sun from Earth, 300 million kilometers away. Before blowing it up, matter could be extracted from it in this way: Of course, to begin with, what is needed is proper detection of all objects orbiting the Sun at a distance of about 200 million km. What is needed, then, is a cloud of drones/satellites to do this.. Then extend distance in the future to further areas of solar system. Not exclusively in accretion disk orbit, but also sphere around the Sun, to detect also non-solar objects..
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nonstop barrage of full page ad walls
Sensei replied to TheVat's topic in Suggestions, Comments and Support
Chrome is a Google product, so this is to be expected.. Conflict of interest.. Currently on my mobile Android, on SFN, ads appear every few posts or threads.