Википедия — свободная энциклопедия
How To Build A Fireball You Can Hold Video
Astrobiology - The Hunt for Life Beyond Earth
The Drake equation, formulated in 1961, estimates the number of alien civilizations we could detect. Recent discoveries of numerous planets in the Milky Way have raised the odds. The final step: Multiply the number of radio-savvy civilizations by the average time they're likely to keep broadcasting or even to survive. If such advanced societies typically blow themselves up in a nuclear holocaust just a few decades after developing radio technology, for example, there would probably be very few to listen for at any given time. The equation made perfect sense, but there was one problem. It would be a third of a century before scientists could even begin to put rough estimates into the equation. Nobody thought for a moment that life could ever take hold in such hellish conditions. None of these planets is an exact match for Earth, but scientists are confident they'll find one that is before too long. That's good news for astrobiologists. Take the Mexican cave.
Free Programming Books
Here is an uncategorized list of online programming books available for free download. The books cover all major programming languages: Ada, Assembly, Basic, C, C#, C++, CGI, JavaScript, Perl, Delphi, Pascal, Haskell, Java, Lisp, PHP, Prolog, Python, Ruby, as well as some other languages, game programming, and software engineering. The books are in various formats for online reading or downloading. This list will be updated daily. Scroll downn, or use the shortcuts below.
Наука и техника - электронная библиотека
Physics and mathematics
Cookies on the New Scientist website close Our website uses cookies, which are small text files that are widely used in order to make websites work more effectively. To continue using our website and consent to the use of cookies, click away from this box or click 'Close' Find out about our cookies and how to change them Physics & Math Log in Your login is case sensitive I have forgotten my password close My New Scientist Look for Science Jobs Light-bending black hole mimic is first you can watch What has the Higgs boson done for us? LHC spots particle that may be new form of matter TODAY: 22:31 10 April 2014 Can matter be made of four quarks bound together? Banish jet lag with a handy mathematical scheduler TODAY: 22:00 10 April 2014 An app based on a complex mathematical model promises full recovery from jet lag in just a few days, even for extreme time zone shifts The fourth state of matter: Consciousness THE BIG IDEA: 20:00 09 April 2014 Dark matter hunters turn to nano-blasts and enzyme ice Most read
Khan Academy - BRAINTEASERS
Глицерин
Глицери́н (1,2,3-триоксипропан, пропантриол-1,2,3) — простейший представитель трёхатомных спиртов. Представляет собой вязкую прозрачную жидкость. Физические свойства[править | править исходный текст] Глицерин — бесцветная, вязкая, очень гигроскопичная жидкость, смешивается с водой в любых пропорциях. Химические свойства[править | править исходный текст] Химические свойства глицерина типичны для многоатомных спиртов. Взаимодействие глицерина с галогеноводородами или галогенидами фосфора ведёт к образованию моно- и дигалогенгидринов. При дегидратации он образует токсичный акролеин: и окисляется до глицеринового альдегида CH2OHCHOHCHO, дигидроксиацетона CH2OHCOCH2OH или глицериновой кислоты CH2OHCHOHCOOH. Место глицерина в обмене веществ живых организмов[править | править исходный текст] Получение[править | править исходный текст] Глицерин впервые был получен в 1779 году Шееле при омылении жиров в присутствии окислов свинца. Производные глицерина[править | править исходный текст] На русском языке:
Antibiotic Resistance
eedwood House Farm is easy to miss. Only a small sign - the bright pink image of a pig - suspended from a fence post hints at anything of significance down the one-way track that leads off the main road. After a few hundred metres of bouncing over mud and gravel, it is the pungent smell that smacks you first. A hundred or so piglets are excitedly clambering over each other or snuffling around the muddy floor of the gated outdoor enclosure where they are waiting to be transported for slaughter. This is the flagship operation of Midland Pig Producers, which runs nine farms across the country producing 80 tonnes of meat a week to supply Tesco, Marks and Spencer and Asda. A decision is expected shortly on Midland Pig’s so-called Foston Mega Farm, which will house 25,000 intensively reared indoor pigs, making it one of the largest in Europe. Infographic National Risk Register The government’s list of the greatest threats facing the country. Major terrorist attacks are an ongoing threat.
