Jump to content


Senior Members
  • Content Count

  • Joined

  • Last visited

  • Days Won


Everything posted by Sensei

  1. @koti Galactic offworlders have specific sense of humour. Off this world. Human can laugh from getting lost in mall, hotel etc. and turn it to anecdote for friends and family. Offworlder can laugh from getting lost in space.
  2. Author of the video could use IR, UV or edited video in post-production. People are making such videos every day to impress viewers, get audience and earn money on advertisements.
  3. Good reason to learn astronomy... Don't get lost in space..
  4. It is easy to cheat in such videos, as laser with 200 mW+ can ignite matchstick from longer distance..
  5. Bullshit. You are using the wrong words. Organic life is trying to optimize energy. The easiest route, the smallest energy usage. If somebody invests time, money and effort, in building dam to provide energy, for further things, actually it is example of optimization of energy. Invest some energy in building device once, so device will work for you for years, instead of you in the future (or better in future generations).. Energy spend on learning at early stage of life + energy spend on learning things which are valuable (i.e. programming, high-tech etc. etc.) << energy spend on doing nothing at primary school + having no college + having no university + having low paid job as a result of the all previously taken "optimizations" at childhood..
  6. "The device is simple: a transparent two-liter bottle is filled with water plus a little bleach to inhibit algal growth and fitted into a hole in a roof." https://en.wikipedia.org/wiki/Liter_of_Light
  7. "Feeding mice helps them to fight viral infection, whereas starvation is a better strategy against bacterial infection — lending support to the proverb 'feed a cold, starve a fever'. Ruslan Medzhitov and his colleagues at Yale University School of Medicine in New Haven, Connecticut, studied the effects of feeding on mice that were infected with either the bacterium Listeria monocytogenes or an influenza virus. Bacterium-infected mice that were deprived of food stayed alive, whereas well-fed animals died. By contrast, almost all mice with flu died when they were starved, but most survived when they were fed. During bacterial inflammation, glucose from food inhibited a metabolic process that protects brain tissue from damage, whereas the sugar protected the brain during viral inflammation." https://www.nature.com/articles/537283c
  8. Correct answer. Test.zip #include <stdio.h> int get( int i, int j ) { j = 3 - j; for( ; j > 0; j-- ) i /= 10; return( i % 10 ); } int swap( int i, int a, int b, int c, int d ) { int result; result = get( i, a ) * 1000; result += get( i, b ) * 100; result += get( i, c ) * 10; result += get( i, d ) * 1; return( result ); } bool check( int i, bool verbose = false ) { if( get( i, 0 ) == 0 ) return( false ); if( get( i, 1 ) == 0 ) return( false ); if( get( i, 2 ) == 0 ) return( false ); if( get( i, 3 ) == 0 ) return( false ); int j; j = swap( i, 0, 1, 2, 3 ); if( verbose ) printf( "ABCD %d\n", j ); if( ( i % 13 ) != 0 ) return( false ); j = swap( i, 1, 2, 3, 0 ); if( verbose ) printf( "BCDA %d\n", j ); if( ( j % 11 ) != 0 ) return( false ); j = swap( i, 2, 3, 0, 1 ); if( verbose ) printf( "CDAB %d\n", j ); if( ( j % 9 ) != 0 ) return( false ); j = swap( i, 3, 0, 1, 2 ); if( verbose ) printf( "DABC %d\n", j ); if( ( j % 7 ) != 0 ) return( false ); return( true ); } int main() { for( int i = 0; i < 10000; i++ ) { if( check( i ) ) { printf( "Result %d\n", i ); check( i, true ); } } }
  9. Yeah. Good idea. Simply check if number 8888888888(8) will have some parts missed.. LCD display problems are the most common way how calculators (and electronic multimeters in fact) are ending up their life being useless.
  10. Antibiotics fight with bacteria. Bacteria can have altered DNA by viruses. There could be prepared custom virus attacking just enemy bacteria at interest. It does not even have to kill bacteria. It could just change bacteria DNA in such a way to have slower rate of reproduction, or change them to being antibiotics helpless again, reversing acquired resistance.
  11. Since original puzzle has been solved, I have puzzle for you Commander: what four-digit number will be solution, if any digit might be used multiple times.
  12. https://www.google.com/search?q=star+trek+the+first+contact+no+money+you+mean+you+don't+get+paid
  13. C'mon, guys and girls. Peace. Love.
  14. It is mathematics. If you start from low base e.g. variable x=1, then growth by 1 to x=2 is 100% increase. Huge! Then growth from 2 to 3 is just 50% increase. Then increase from e.g. 100 to 101 is just 1% increase. Start improvement from yourself. If the rest of people will do the same, then we will have global improvement of humanity. Do you have smartphone, tablet, computer, laptop? (obviously yes!) Write app for it. Instead of buying and/or downloading ready one from store. During development of some app, you will see how much you did not know.. You will gain a lot of knowledge. Every day, one project. Or if you are slow learner, every week, one project. Get Arduino or other microcontroller. Build electronic device by yourself. Program it so you will be able to remote control it from your smartphone and/or tablet through Bluetooth and/or WiFi. e.g. read temperature and/or pressure from environment and store on SD/SDHC card, every second in CSV file with time read from real-time clock, with Bluetooth connection to it to download file from SD/SDHC. Later you will be able to load it in OpenOffice Spread Sheet and/or Excel, and analyze gathered data. Every week, one project.
  15. If you would merge two layers of polarization filters. One with e.g. p-polarization, and second one made by material which is able to rotate polarization vector due to applied electric or magnetic field, in such a way that will be opposite axis e.g. s-polarized. They working together would be creating opaque (black) material on demand. https://en.wikipedia.org/wiki/Pockels_effect "Pockels cells are used in a variety of scientific and technical applications. A Pockels cell, combined with a polarizer, can be used for switching between no optical rotation and 90° rotation creates a fast shutter capable of "opening" and "closing" in nanoseconds. The same technique can be used to impress information on the beam by modulating the rotation between 0° and 90°; the exiting beam's intensity, when viewed through the polarizer, contains an amplitude-modulated signal. This modulated signal can be used for time-resolved electric field measurements when a crystal is exposed to an unknown electric field.[2][3]"
  16. Chickens require less nutrients to grow up than pigs and cows (which also produce methane gas). They are also cheaper and healthier for customer. Fish farms are better for environment than fishing of wild fishes. Their population is under control of human. Fish farm does not deplete natural population of fishes, so they can reborn. https://www.fcrn.org.uk/research-library/feed-conversion-efficiency-aquaculture-do-we-measure-it-correctly "Higher protein or calorie retention means higher efficiency. The results show that, on average (weighted according to global production levels of the nine aquatic species studied), 100 g of protein in aquaculture feed will be converted into 19 g of protein for the human food supply (19% retention), and that 100 kcal of aquaculture feed will be converted into 10 kcal for the human food supply (10% retention). Protein retention ranges from 14%–28% for the aquatic species studied, and 13%–37% for the land species. Calorie retention ranges from 6%–25% for the aquatic species and 7%–27% for the land species. The best performers across all species considered are chickens, followed by Atlantic salmon."
  17. You can use Wolfram Alpha to plot two graphs, so you can see whether and/or where they are crossing each other.. https://www.wolframalpha.com/input/?i=f(x)%3Dx^2%2Cf(x)%3D16^x With limits x = -1 ... +1 https://www.wolframalpha.com/input/?i=f(x)%3Dx^2%2Cf(x)%3D16^x+for+x%3D-1+to+%2B1
  18. You are mistaken over-trusting DNA, to catch true murderer after many years. Because it might be as well misused against incorrect innocent person. I will give you examples how it can put somebody innocent to jail, or even sentenced to death, or life in prison: - imagine you have girlfriend, or girl for one night met at club, have sex with her at night, she is going early to job, leaves your apartment early and somebody is attacking her in the middle of route, but leaves no his DNA, or leaves DNA. Now, police officers are checking DNA on the body, and find it is yours. Are you murderer? Are you rapist? Did you participate in multi person rape on her? No, you just had normal sex with her.. But you are unlucky that she has been attacked right after it.. Even worse if police finds out you had argue through SMS or Internet with her, just before somebody else attacked her.. - imagine you are working at mall. Yours responsibility is to put bottles with beer, wine, vodka, whisky etc. to refrigerator or simply on shelf. Client takes bottle. And many hour later it is used by somebody on the party as weapon (broken bottle), and somebody dies due to injures. Again, police officers are checking tool used to commit murder, and find out your DNA on it... Again, you can be mistakenly sentenced by court, innocent person put to jail, thanks to DNA found on tool used to committing crime.. If police had your DNA because you are in database already, they will find you immediately, and you have immediate troubles, but if not, they have "trace", and many (dozen) years later DNA from that crime scene can be compared with your DNA and match! Match, but not the true murderer! ps. My post is not against "statue of limitations" nor for it.. but just not to have absolute trust in DNA, even if it matches..
  19. I think that the key word here is personal... Audio files made by 3rd party musicians are not your personal files.. Everybody around the world can have them..
  20. Bible = Old Testament + New Testament. You should be more specific which part of it, you are interested in. Generally, Old Testament "suspicious" sources were kept, and New Testament "suspicious" sources were destroyed (or attempted to be destroyed). https://en.wikipedia.org/wiki/New_Testament_apocrypha https://en.wikipedia.org/wiki/Pseudepigrapha https://en.wikipedia.org/wiki/Biblical_apocrypha
  21. I was just reading this article prior writing my reply.. Word "perfect" has bad connotations for me. Somebody "perfect" cannot being more enhanced, in contrary to "master".
  22. "practice makes master"..
  23. Apart from cancer, pollution of air can cause pneumoconiosis. https://en.wikipedia.org/wiki/Pneumoconiosis Dust obviously has the highest concentration in coalmines, silica mines, factories processing ores and surrounding them areas. Therefor industry workers are the most affected by it. "In 2013, it resulted in 260,000 deaths globally, up from 251,000 deaths in 1990.[4] Of these deaths, 46,000 were due to silicosis, 24,000 due to asbestosis and 25,000 due to coal workers pneumoconiosis.[4]" Read pathogenesis section in the above article.
  24. Human can get rid of money and the all evilness associated with them i.e. there will be no thieves, there will be no murders to kill witnesses of stealing, there will be no corruption, there will be no hunger, no people dying unable to buy food, medicament or unable to afford health care, there will be no poor, nor wealthy, no greediness nor jealousy of possession of things you don't have but others have.. no drug dealers, nor drug wars.. People will be well educated, if they will be intelligent enough to use free of charge universities.. In the distant past, people lived in small villages, each other voluntarily helping other members of community because of goodness from the bottom of their hearts..
  25. ...first draw it at the right scale... Sun has radius ~0.7 mln km Distance from the Sun to the Earth is ~150 mln km 150 / 0.7 = ~214 x Have 1920x1080 screen resolution? 1920 is width of the entire screen. 1920 / 214 = ~9 pixels. Draw circle with 9 pixels radius on the leftmost coordinate at x=0... and less than 1 pixel on the rightmost coordinate at x=1919 will be the Earth.. Nonsense. Do you have classical lightbulb in room? It's obeying inverse-square law too. Swansont's comment was about inverse-square law.
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.