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Sensei

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Everything posted by Sensei

  1. You seriously ask such a question about color, at a time when you should be investing in solar panels on your roof.. ? Buy rooftop solar panels in one.. ps. Make it pink.. Things made from Copper acquire H2O and CO2 from the air, and change to Cu2CO3(OH)2. https://en.wikipedia.org/wiki/Basic_copper_carbonate https://en.wikipedia.org/wiki/Patina Which is on the roof of most medieval buildings.. When their builders used a copper roof..
  2. Cheap, really cheap wines, or with too high a % of ethanol can be made by mixing the juice with ethanol from distillation.. So basically a scam.. Here, if a wine costs less than the equivalent of €5, I approach it very skeptically.
  3. https://www.nature.com/articles/s41366-020-00691-4 "Conclusions. The risk of maternal death increases with BMI; it multiplied by 1.6 in overweight women and more than tripled in pregnant women with severe obesity."
  4. Is that the only thing that matters to you? When you can become "Planck v2.0"? You didn't give enough thought and attention to what I said in my previous posts.. Indeed, interesting. That is why I participated.. Molecules/atoms/molecules are not constant.. they are in constant motion depending on the temperature.... (or vice versa: temperature tells how much they move and/or rotate etc.).. If you make a line of atoms/particles/molecules that will form 1/3 in what time and length should maintain this state.. ? In which frame of reference should Y=1, and X=3, or whatever? In which FoR you measure inverse-square-law.. ?
  5. So, replace 1 by any rational, and Pis will cancel, and you have a rational result.. ps. How about making it harder: working with both 2D (obeying above) and 3D (V=3/4 x PI x r^3) ? Then, there are more physical equations taking irrational as parameters, find whether they have rational answers like above..
  6. It depends on r, of course. Interesting point. 2^(1/2) * 2^(1/2) = 2. From two irrational numbers we get, a rational number. So what rational number can be obtained from 2 x PI^2 (or whatever you meant) ? Is PI^2 a rational number? Is it possible to find such an r that d=2 x PI x r is rational.. ? Is it possible to find such an r=PI^n that d=2 x PI x PI^n is rational.. ?
  7. Is d=2 x PI x r a rational or irrational number? The experimenter has it all turned around: PI = d/(2 x r)
  8. A simpler to visualize example. In a computer, you have an array of bits. 0 and 1. The bit index is an integer. But there are millions/billions/trillions of them in this array. You can store PI or e, in binary in this array, but a human won't look at it deeply enough.. 6-7 decimal digits from an ordinary person is far too much.. An irrational number is irrational only in theory, when you use it in everyday mathematics, you don't use an irrational number, but something that is very close to it, with enough precision that is needed at the time of calculation.
  9. Why do you go from theoretical physics? Go from experimental physics.. to finding or not finding quantization.. For example. 1 cm^3 of water has mass 1 gram. 1 g/cm^3 1 g/cm^3 / 18.016 g/mol = ~ 0.0555 mol/cm^3 ~ 0.0555 mol/cm^3 * 6.022141*10^23 mol^-1 = ~ 3.3427e+22 3.3427e+22 ^ (1/3) = 32.2 mln water molecules in any X,Y,Z axis in 3D world. 0.01m / 32.2 mln = 310 pm = 0.31 nm Can you move a quantum object with a precision of more than 0.31 nm and be really very sure that this is the result of your action and not some other thing acting on the particle? Can you move it? With what kind of precision? Repeat the experiment with different particles until you find a boundary that cannot pass.. It would be interesting experiment, a single, literally single atom of some heavy element which can be detected by MRI or so, put in a piece of solid ice (or whatever else transparent to MRI or so), then record its path, when it goes from the top to the bottom sinking due to its weight, due to the gravity or whatever else..
  10. There are websites that list all surveillance cameras and/or private CCTV cameras with screwed/weak configurations that you can simply log on to and watch what their "owners".. https://www.garoweonline.com/en/news/somalia/al-shabaab-destroys-cctv-cameras-along-major-roads-in-mogadishu-with-ieds
  11. It will work with user data like documents, photos, things which are not encrypted, etc
  12. You can back up Windows drives on Linux. Use a live pendrive with Linux. Boot your computer from it. Open a terminal and use e.g.: dd if=/dev/sda of=/dev/sdb bs=16M This operation will make a binary mirror of your drive(s). /dev/sda is your Windows drive. If you have multiple partitions they all will be stored. You can use /dev/sda0 /dev/sda1 etc. if you have multiple partitions and want to backup just a single one at a time. /dev/sdb is your second empty drive (it will be overwritten). Let's assume that it is a 2GB external USB drive. alternatively use image file as of e.g. of=/dev/sdb0/image.img If you are not familiar with the dd command in Linux, get some spare empty 120 GB SSD drives and do some experiments first.. You can plug in your mirror instead of the original one to see if the OS still boots from it. Have you heard of RAID? It can be configured to create a mirror in real time.. ..some modern laptops do not have a CD/DVD drive.. do you have one? In modern laptop you have to use 1) pendrive (limited capacity) 2) external 2GB drive(s) plugged to USB v3.x (preferably) 3) external CD/DVD drive 4) network drive (NAS) (your own = more expensive, or less preferably cloud - but if you have metered Internet like LTE, it will be expensive too at the end)
  13. ..unless you are in Florida, US.. https://en.wikipedia.org/wiki/2000_United_States_presidential_election_in_Florida
  14. ..it is way too late.. ..if you are really advanced, you can create the entire Universe yourself..
  15. It's all fun. ..as long as you are the Emperor..
  16. When I RMB on your math (on desktop), I see no MathJax popup menu.. Did you use [ math ] or [ latex ] open & close tags?
  17. ..had they done so, they would have been imprisoned for 15 years in a gulag in Siberia.. In modern Russia, if someone has a blue T-shirt and yellow pants, goes to jail.. ..therefore, the key would be to reach out to them in such a way that they are well informed..
  18. Try this one: Japanese brain aging test. Use the stopwatch.
  19. Net: "Tiny cracks in your nose's membranes can injure these blood vessels, making blood gush from your nose at what seems like random times." "if you get nosebleeds a lot, there may be a reason you can pinpoint: Dry climates or dry, heated air that dries out the inside of your nose." "If you come into contact with an allergen, your body releases histamine which causes the classic symptoms of an allergic reaction. If any of the blood vessels in your nose become over dilated, as a result of persistent histamine production, this can cause tissue fragility than easily leads to a nose bleed." https://www.google.com/search?q=nosebleed+spontaneous
  20. ..can't you see the faces in these pictures? Don Kichot picture has more than 20 faces.. Birds are eyes, noses and lips.. This is thread about pattern recognition by the brain. A pretty good bit of science.. https://en.wikipedia.org/wiki/Pattern_recognition_(psychology)#Facial_pattern_recognition
  21. Good to have the source code Backup. To restart. The gamma ray is red-shifted in one reference system and blue-shifted in the other..
  22. Only what is known for sure is that photons emitted in the distant past are redshifted i.e. have much lower energies/frequencies than in modern times.
  23. Epoxy resin can be used both for gap filling (if any) and for a protective layer.
  24. Build it. It can be done this week. Creality Ender 3 new one costs $220 on eBay. https://www.google.com/search?q=Creality+Ender+3+ebay How do you turn it into a laser engraving or wood engraving machine? Design connector in 3D app or download ready project for free. Plug laser with enough power on the connector and have it controlled through hotend fan wire.. It will be on one of sides of existing hotend attached by screws.. You can use any laser this way with enough power. ..or buy ready extension for Creality Ender 3 S1 (but it is for S1, which is for $400) https://www.google.com/search?q=CV-Laser+module+1600mW+for+Creality+Ender-3+S1 It is ~ $80/75 EUR here. You will spend $400 + $80 = $480. Does it require a lottery? But it is a complete replacement of the hotend, so you will not have a 3D printer, unless you replace it back to the original hotend (~ 1 hour loss each time, so it is better to buy 2x Creality Ender 3 and 3 S1, less hassle). Attachable connector is handy. Design one which will hold a mini-drill and you will have a wood engraver. Installation of the said laser module:
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