Pearls Before Breakfast - washingtonpost.com
HE EMERGED FROM THE METRO AT THE L'ENFANT PLAZA STATION AND POSITIONED HIMSELF AGAINST A WALL BESIDE A TRASH BASKET. By most measures, he was nondescript: a youngish white man in jeans, a long-sleeved T-shirt and a Washington Nationals baseball cap. From a small case, he removed a violin. Placing the open case at his feet, he shrewdly threw in a few dollars and pocket change as seed money, swiveled it to face pedestrian traffic, and began to play. It was 7:51 a.m. on Friday, January 12, the middle of the morning rush hour. Each passerby had a quick choice to make, one familiar to commuters in any urban area where the occasional street performer is part of the cityscape: Do you stop and listen? On that Friday in January, those private questions would be answered in an unusually public way. The musician did not play popular tunes whose familiarity alone might have drawn interest. The acoustics proved surprisingly kind. So, what do you think happened? So, a crowd would gather? "Oh, yes."
reftut
<div class="noscript"><p><strong>Please note: Many features of this site require JavaScript. You appear to have JavaScript disabled, or are running a non-JavaScript capable web browser.</strong></p><p> To get the best experience, please enable JavaScript or download a modern web browser such as <a href=" Explorer 8</a>, <a href=" <a href=" or <a href=" Chrome</a>. </p></div> perlreftut - Mark's very short tutorial about references One of the most important new features in Perl 5 was the capability to manage complicated data structures like multidimensional arrays and nested hashes. Fortunately, you only need to know 10% of what's in the main page to get 90% of the benefit. One problem that comes up all the time is needing a hash whose values are lists. Make Rule 1
Copenhagen interpretation
The Copenhagen interpretation is one of the earliest and most commonly taught interpretations of quantum mechanics.[1] It holds that quantum mechanics does not yield a description of an objective reality but deals only with probabilities of observing, or measuring, various aspects of energy quanta, entities that fit neither the classical idea of particles nor the classical idea of waves. The act of measurement causes the set of probabilities to immediately and randomly assume only one of the possible values. This feature of mathematics is known as wavefunction collapse. According to John Cramer, "Despite an extensive literature which refers to, discusses, and criticizes the Copenhagen interpretation of quantum mechanics, nowhere does there seem to be any concise statement which defines the full Copenhagen interpretation Background[edit] The Copenhagen interpretation is an attempt to explain the mathematical formulations of quantum mechanics and the corresponding experimental results. 1.
The Top 20 Most Bizarre Experiments of All Time
What happens if you give an elephant LSD? On Friday August 3, 1962, a group of Oklahoma City researchers decided to find out. Warren Thomas, Director of the City Zoo, fired a cartridge-syringe containing 297 milligrams of LSD into Tusko the Elephant's rump. With Thomas were two scientific colleagues from the University of Oklahoma School of Medicine, Louis Jolyon West and Chester M. Pierce. 297 milligrams is a lot of LSD — about 3000 times the level of a typical human dose. Thomas, West, and Pierce later explained that the experiment was designed to find out if LSD would induce musth in an elephant — musth being a kind of temporary madness male elephants sometimes experience during which they become highly aggressive and secrete a sticky fluid from their temporal glands. Whatever the reason for the experiment, it almost immediately went awry. In the years that followed controversy lingered over whether it was the LSD that killed Tusko, or the drugs used to revive him. Dr. Dr.
Delayed Choice Quantum Eraser
Comment: The idler photon first encounters the prism PS, where it's path is bent to ensure it heads off where it is supposed to – one path for photons from region A, a different path for photons from region B. The idler photon next encounters a 50-50 beamsplitter BSA or BSB. The beamsplitter will either reflect the idler photon off course and into the detector D3 or D4; or it will allow the photon to pass through and continue (toward the reflecting mirror MA or MB). QM dictates that it will go one way or the other a random 50% of the time, i.e., a 50-50 chance either way. If the idler photon is reflected at BSA or BSB into the detector D3 or D4, it will be detected with which-path information intact. As stated earlier in the paper, "The registration of D3 or D4 provides which-path information (path A or path B) of [idler] photon 2 and in turn provides which-path information of [signal] photon 1 because of the entanglement nature of the two-photon state . . .."
Quantum Entanglement Could Stretch Across Time
In the weird world of quantum physics, two linked particles can share a single fate, even when they’re miles apart. Now, two physicists have mathematically described how this spooky effect, called entanglement, could also bind particles across time. If their proposal can be tested, it could help process information in quantum computers and test physicists’ basic understanding of the universe. “You can send your quantum state into the future without traversing the middle time,” said quantum physicist S. Jay Olson of Australia’s University of Queensland, lead author of the new study. In ordinary entanglement, two particles (usually electrons or photons) are so intimately bound that they share one quantum state — spin, momentum and a host of other variables — between them. Physicists have figured out how to use entanglement to encrypt messages in uncrackable codes and build ultrafast computers. Olson explained them with a Star Trek analogy. “It stimulated our imaginations,” said Fuentes.
