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How do lasers work?

The light emitted is coherent, which means that it doesn't spread out like regular light but remains in a narrow beam. This is because, unlike ordinary white light, which contains a range of colors, laser light contains just one. As a result, when it comes into contact with another material, all of the light, being of a single wavelength, bends uniformly and therefore does not scatter.In practice, this means that a laser beam can be emitted over extreme distances without losing its focus.Because of this unique property of lasers, they are often used when precision is of paramount importan..

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Why do people cry when they are sad?

Like laughing, crying is largely involuntary and somewhat social. Those who cry in public often receive sympathy from those around them. Crying is also therapeutic. A large amount of research subjects report feeling better after they cry.\nAlthough statistically, some people cry more easily than others, scientists are not sure why. People who experience trauma tend to make up a portion of those who cry easily, though trauma is not exclusively the reason. Gender also plays a role, as women tend to cry more easily than men. Scientists believe, however, that women cry more easily because it is mo..

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What are some ideas for a neon party?

Tell party guests to wear UV-reactive clothing. If that's not possible, a simple white garment works well, as white clothing is a fail-safe way for one to glow during a black-lit party. Many stores and online retailers sell neon reactive clothes in an abundance of colors, including bright greens and blues. If there is a dance area at the party, use a strobe light to add an exciting accompaniment to the neon lighting.\nNeon face paint enables guests to create great patterns on their bodies that glow brightly under UV lighting. It is strongly recommended to leave at least one room of the pa..

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What are the characteristics of the sociolinguistic theory?

One common characteristic of sociolinguistic theory is that it tends to examine the effects of society on language through what American linguist William Labov has called "secular linguistics." By this, Labov indicates a theory of language departing from Noam Chomsky's often cited presumption that language and its use can be wholly dissociated from social context. In other words, Chomsky's framework suggests that language exists and can be examined outside its social use, a position many sociolinguistic theorists deny.\nSociolinguistic theory is often applied through a specific metho..

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How do Hindus worship?

Puja often takes place outside the temple, and it is mostly done individually as opposed to in a communal form of worship. Puja mainly takes place in the home, where Hindus set up a special shrine for their favorite gods and goddesses. A shrine may be as simple as a small picture or statue or a small altar; it can also be big enough to occupy an entire room.Puja is strictly done three times a day and often with all or most members of the family present. During puja, the names of the gods and goddesses are repeated as well as mantras. Water, flowers, incense and other offerings are also offered..

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Why do Muslims wash before they pray?

Cleanliness is of extreme importance in Islam, and the notion that physical cleanliness is symbolic of spiritual cleanliness is enforced by the Wudu' ritual. There are two essential forms, either involving hands, feet and face, or a complete ablution, including the mouth, nostrils and head. It is well understood that regular bathing is beneficial to a person's health, but in the time of Islam's introduction in the Middle East, there was little concern given to such things. Not only was clean water scarce, but what water could be found was often reserved for consumption. By putti..

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What is the difference between a delusion and a hallucination?

A person experiencing delusions often holds strong beliefs that may or may not be based on fact. For example, an individual may believe with certainty that everyone she encounters is spying on her and refuse to go outside because of the spies. Delusions can also come across to others as illogical or bizarre, even if based on factual truth.\nAlternatively, someone experiencing hallucinations may hear voices in her head that speak clearly and seem real, which may lead the individual to act out in response to the voices. For instance, people suffering from mental illness sometimes do things after..

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How do you access Joel Osteen's daily devotionals?

The Today's Word devotions focus on Osteen's general message of God's goodness and how believers should search for blessings in life. Full access to the Today's Word devotions and some other ministry resources requires online registration. Some third-party websites post the Today's Word devotions and credit Joel Osteen Ministries as the content provider. Joel Osteen Ministries regularly publishes various articles, blogs, forums and devotionals as a part of its Hope for Today spiritual resources.\nJoel Osteen, senior pastor of Lakewood Church in Houston, is a best-selli..

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What are the meanings of astrological signs?

Astrology has its roots in the geocentric universe theory. Ancient scientists believed that the constellation the sun was going through during a given window affected the personalities of children born within that time.\nAries, or the ram, goes from March 21 to April 19. Aries people are said to be creative, adaptive and insightful.\nTaurus, the bull, lasts from April 20 to May 20. Taurus signs have high strength, willpower and stamina.\nGemini, the twins, encompasses everyone born between May 21 and June 20. They are said to be flexible, balanced and adaptable.\nCancer, the crab, lasts from J..

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How does the concept of nature and nurture influence human behavior?

Research appears to show that a trait such as an individual's IQ level, commonly assumed to be an inherited trait, can be subject to alteration by the influence of family environmental factors. Culture is also a factor in the development of behavioral traits because of its generation-to-generation transmission of accepted social norms and parameters.The 20th-century developmental psychologist, Erik Erikson, proposed that individuals develop their personalities, learning abilities and social skills by progressing through a series of eight interactive stages beginning in early childhood and..

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