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Sensei

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Everything posted by Sensei

  1. Aristotle lived ~ 2000 years before Newton..
  2. Sort of.. #include <stdio.h> int main( void ) { int x = 0; do { printf( "x %d\n", x ); x *= 2; } while( x * 2 != x ); return( 0 ); } vs. #include <stdio.h> int main( void ) { int x = 1; do { printf( "x %d\n", x ); x *= 2; } while( x * 2 != x ); return( 0 ); }
  3. Nonsense. Search net for keywords: "female eggs quality per age graph" "female eggs count per age graph" "female eggs at birth" e.g. "By puberty, she usually has half that—and each month after puberty, she loses up to 1,000 eggs. Of those, only one egg is matured and ovulated each month." Similar like with male sperm, only a fraction of them are good quality and should be used for reproduction. That is why medics working on in-vitro have so large failed pregnancy rate. It takes a long time to find out which egg and which spermatozoid are in good conditions and are able to survive and form an embryo. From around 1,000,000 eggs at female birth, typical women has 1 to 3 child. One per a million, one per a half million, one per 333 thousands, chance of becoming human. The rest dies. Live people are "lucky" ones.. ..majority of ever living women in the history of this world, never reached to menopause, because they died a long before 40.. Long life of modern human is result of modern medicine, mass vaccination, decreased chance of dying during pregnancy and childbirth, cleaner environment and rules of making and preserving foods etc. standards.. e.g. search net for maternal mortality rate. https://ourworldindata.org/maternal-mortality One hundred and more years ago, it looked much worser than on the graph in the article.
  4. Some people are simply too immature, regardless of age, to have driving license.. Driver-to-be should be trained on realistic car simulators. Simulation of the worstest drivers around you, with the worstest possible accidents.. After being part of a simulated crash with almost not possible to survive probability, they should realize driving is not for them. Astronauts-to-be and airplane pilots-to-be are learning how to act during accident. Driver-to-be are learning just "how to park a car" and similar nonsense.. The result of this, is in the death statistics each year.. They just don't know what to do when things go wrong on the road. Nobody taught them.
  5. Meteorites and other solid planets (at the moment, we can discuss only about two: Mercury and Mars) have none or too little volcanic activity. You should start from reading the English version of Granite article on Wikipedia. Always start with the English version, because the local language versions are usually very poor in detail (except articles about the history of the country etc. local things) https://en.wikipedia.org/wiki/Granite It explains why granite can't be (easily) found in cosmic space in the first paragraph "It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground.". Without volcanoes, without volcanic activity, there is no granite as well.
  6. You can open photo in viewer and take screenshot. Open built-in Windows Paint and press Paste and "Save As..". But iNow reminded me that you can also take screenshot of gallery on mobile too. Search net "how to make screenshot (mobile model name)". Different brands/models have different procedure. Of course if you are unsure how to do it (there is no magic "print screen" key after all).
  7. Absolutely, yes. It will solve problem with metadata. Lens can have unique imperfections added intentionally or non-intentionally. Analyze of enough amount of raw photos can be used to determine if they came from the same device. Change of resolution i.e. rescale down more than 2x with bi-linear interpolation can help to hide them. The same is with printers, copiers and scanners. Printed page has invisible by naked eye details which can be used for identification of exact printer device and/or model and indirectly person (if he/she is unique user like in home office). If you download document from some websites e.g. government web page, there are added unique metadata to each downloaded file. If somebody will share it on-line, analyze of metadata can reveal who downloaded and from what IP and when it happened. If you download some such important file, use VPN/proxy/Tor to download it again, and compare them e.g. 7zip adds branch to Windows explorer. RMB on file, pick CRC SHA branch, then pick one of them e.g. SHA-256. Repeat with other file from alternative computer with alternative network transmission via VPN/proxy/Tor. Compare checksum. If they differ, document has unique metadata and/or was generated dynamically and they can be used for tracking leakage.
  8. That looks very suspicious... If somebody truly wants to just read the all messages that you posted, you can't do anything with it because in the worst scenario he or she will write crawler/harvester which will visit person profile every couple minutes or seconds (script with wget/curl in a loop), parse it, and check if sonebody wrote anything new and then parse new messages and add to the database. ps. Beware of attaching photos. Remove meta-data from photos. Don't add photos from smartphone on mobile version of this site directly! Use PC. You have no idea what meta-data they contain! Always check them if you took photo. The details of the device, once automated (with millions other photos), also can be used for identification and tracking. ps2. Beware of attaching links from newsfeed or links from search engine etc. They have your personal GUID (global unique identifier) to track you and activity ("xxx was shared by yyy number of people" there is such field on FB). Always remove query string to absolute minimum (on mobile it is very unpleasant job)..
  9. Distance depends on air polution, humidity, fog, dust etc. Water and other particles disperse light in the all directions randomly. In vacuum there is not enough particles to scatter photons thus we can see light from distant stars..
  10. What is missing, but a key essential element (including this thread), in the Standard Quark Model there are "valence quarks" i.e. those that contribute to the total Baryon Number, and other quantum numbers, and those that are not valence quarks (they cancel out their quantum numbers with their antiparticles). https://en.wikipedia.org/wiki/Quark_model Some people/scientists simply skip word "valence", taking it as granted, while talking about "the number of quarks in composite particle".
  11. Here you have nice explanations of various types of manometers with images: https://www.engineeringclicks.com/manometer/
  12. Experimentally.. e.g. have thermometer and manometer. Increase temperature with fixed volume (closed container) and observe readings from manometer..
  13. The same like with my quantum scale decay example - some rivers appear, some rivers occasionally disappear, e.g. rain/dry weather and their quantity changes..
  14. Quantity of objects is exact integer number (unless multiverse or parallel universes are introduced). At quantum level everything changes and do it very fast in human terms. One measurement you have neutron, in another you may have decay of unstable isotope in which neutron was part of nucleus, and your previous measurement no longer represents current state..
  15. Oncogenes do not cause cancer. They just have the potential to cause cancer. that is, after severe code damage during replication, it may prevents programmed cell death. For me thread title sounded more like you are interested in "genetic disorder", "genetic disease", not "cancer".. Damage of the code done several generations ago, which spread to organim offspring. https://en.m.wikipedia.org/wiki/Genetic_disorder To some extent genetic disorders are fixable by specially prepared viruses which will inject the corrected genetic material into existing cells and fix the problem. Such therapy is extremely expensive, counted in hundred thousands or millions USD, per person, and only the richest people can afford it, for the rest there is needed crowdfunding.. https://en.m.wikipedia.org/wiki/Viral_vector https://en.m.wikipedia.org/wiki/Oncolytic_virus
  16. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=c22944b8-8733-4689-be0c-f320467f79ea&version=15 "Active ingredient (per tablet) Calcium Carbonate USP 750 mg"
  17. ..but OP didn't say the answer should be in Python...
  18. Hangman game? In two weeks? Your teacher is very gracious.. ps. If you will write it in 60 minutes, you will be spared..
  19. Nerds and geeks are not antisocial. They simply don't want to waste their time on talking with lower form of intelligence i.e. people who mock of them.. Nerds and geeks are spending time with other nerds and geeks. Likewise people understand each other, have common worldview, have common subjects for discussions etc. etc.
  20. Regardless of source of data there are stock operations like stock split and stock merge which dramatically change stock price when in the reality they are neutral . Read here: https://en.m.wikipedia.org/wiki/Stock_split https://en.m.wikipedia.org/wiki/Reverse_stock_split Which will completely confuse script or program which doesn't handle them or stock data doesn't contain information about the operation. E.g. one day stock price is $100 and the next day is $20. Script will interpret it as 80% drop of price when in the reality there was no drop but quantity of shares was 5x multiplied. Yet another operation influencing price is dividend. Read here: https://en.m.wikipedia.org/wiki/Dividend
  21. Are you against shale gas and fracking technology only? Or against drilling tradidional way natural gas too? In your posts you are mixing them. 39 mln tones worldwide is leakage from both technologies. Fracking is minority of worldwide production of gas. Contrary to US were it is dominant technology. (People in US are often forgetting that World is not only US..) Decide if you want to talk about US or World. Don't mix World data with US data. Keywords for search engine "natural gas market share" "shale gas market share". https://www.eia.gov/todayinenergy/detail.php?id=27512
  22. It is easy to dismiss it as "prime trigger of global warming". Anthropogenic methane emissions worldwide in 2019 was 363 mln tons. 33% of it was coal, oil and gas production, distribution and usage. USA had 6.2% share of methane emissions in 2012. In 1970 it was over 11%. (in absolute numbers it also dropped). See table in below article. https://en.m.wikipedia.org/wiki/Methane_emissions Coal, oil and gas industry by themselves should be the most interested in methods limiting leakage of methane because they simply can't sell leaked product to end customers and lose money. If entire US would stop coal, oil and gas production and usage (regardless of whether it is using fracking or not), methane emissions worldwide would drop only by 2%. Attempt to fight with anthropogenic global warming is job of entire worldwide population, not just one country, or group of countries. Personally I think attempt to fight with it by taxation is silly and instead of solving existing problems, it makes new ones, economical e.g. movement of investors to countries without this silly CO2 emission tax. Which ends up with people being fired (unhappy and rejecting AGW), production unprofitable, reduction of country export (higher costs of production) etc. etc.
  23. If aim is to have Deuterium, search net how to make heavy water. Once you have heavy water you can just do electrolysis of water. Typical source of Hydrogen in lab is electrolysis of water. Normal tap water has very little amount of Deuterium. Sea water has a bit more. Search net for "abundance of Deuterium". It is 1 per 6400. So there are three possible combinations H2, DH and D2. H2 is the most abundant and D2 is the least abundant. Similar situation is with water. There are three combinations H2O, HDO and D2O. From normal water you make semiheavy water and then semiheavy water is enriched to heavy water. https://en.m.wikipedia.org/wiki/Semiheavy_water From more info read production of the heavy-water https://en.m.wikipedia.org/wiki/Heavy_water

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