CULTURAL QA 01-2024-30A All the BELOW QA are from Quora digest to me on 30-01-2024.
Quora answers need not be 100% correct answers .Compiled and posted by R. Gopalakrishnan, on 30-01-2024 Q1 Howdid talking birds like parrots evolve? A1 Silk Road,AI Expert Mon First of all, let's get one thing straight: birds are dinosaurs. Yep, you heard me right. Birds are the living descendants of a group of smallcarnivorous dinosaurs called theropods that lived in the LateJurassic period, about 150 million years ago. These theropodshad feathers, but not for flying. They used them for insulation, camouflage, display, andmaybe even gliding. One of thesefeathered theropods was Archaeopteryx, the first known bird.It had wings and a wishbone, but alsoteeth and a long bony tail. It was a transitional form betweenreptiles and birds. How did these theropods become birds? And how did they learnto sing? Well, it turns out that there are two main factors involved: natural selection and sexualselection. Natural selection isthe process by which organisms adapt to their environment and survive betterthan others. Sexual selection isthe process by which organisms attract mates and reproduce more than others. Natural selectionfavored theropods that could fly, because flying gave them an advantage inescaping predators, finding food, and exploring new habitats. To fly, they needed lighter bones, stronger muscles, and moreefficient lungs and hearts.They also needed more complex brains to coordinatetheir movements and navigate in three dimensions.These changes made them more bird-like over time. Sexual selectionfavored theropods that could sing, because singing gave them an advantage inattracting mates, defending territories, and communicating with each other. To sing, they needed a special organ called the syrinx, whichis located at the base of the trachea (windpipe).The syrinx can produce complexsounds by vibrating thin membranes that are controlled by muscles. They also needed moreflexible brains to learn and memorize songs and sounds. These changes made them morevocal over time. Understand, notall birds can talk like parrots. That's because parrots belong to a group of birds calledpsittaciformes, which have some unique features that make them especially goodat vocal learning. Vocal learning is theability to modify sounds based on experience and social interactions. It is rare in animals and only found in a few groups, suchas humans, whales, dolphins, elephants, bats, and some rodents. Parrots have a large brain relative to their body size, anda high density of neurons in their forebrain.They also have adirect connection between their motor cortex (which controls movement) andtheir brainstem (which controls the syrinx).This allows them to precisely control their vocalizationsand imitate sounds they hear. Parrots also have a long lifespan and a complex socialstructure, which give them more opportunities to learn from each other and fromhumans. MY NOTE- Very informative answer. Q2 Doyou know a joke about an elderly couple? A2 Andras Lu,Sep 12 An elderly couple had dinner at another couple's house, andafter eating, the wives left the table and went into the kitchen. The twogentlemen were talking, and one said, “Last night we went out to a new restaurant and it wasreally great. I would recommend it very highly.” The other man said, “What is the name of therestaurant?” The first man thought and thought and finally said, “What isthe name of that flower you give to someone you love? You know, the one that'sred and has thorns.” “Do you mean a rose?” “Yes, that's the one,”replied the man. He then turned towards the kitchen and yelled, “Rose, what's the name of thatrestaurant we went to last night?” Q3 WasBeethoven really blind and deaf? How did he write music? A3 Silk Road,AI Expert10h Beethoven was notblind. But he was deaf. He started losing his hearing when he was about 28 years old,which was around 1798.He noticed that he had troublehearing high-pitched sounds and that his ears would ring constantly. He also had severeheadaches and stomach problems.He tried all kinds of treatments, like baths,herbs, pills, ear trumpets, but nothing really helped. The cause of his deafness is still a mystery and it gotworse over time. By 1818, when he was 48 years old, he had to use notebooks tocommunicate with people. He would ask them to write down what they wanted to say, and he would answer them out loud or write back. He also wrote down his thoughts and feelings in thesenotebooks, which are called conversationbooks. By 1824, when he was 54 years old, he was almostcompletely deaf. He could no longer hear speech or music normally. He could only feel the vibrations of the instruments or hisown voice.That's why he had to be turned around to see the applause when heconducted the premiere of his Ninth Symphony, which is one of his most famousworks. But even though he was deaf, he never stopped making music.He used his memory and imagination tocreate sounds in his mind. He also used a special device called a resonator, which was awooden rod that he attached to his piano and bit with his teeth.This way, he could feel thevibrations of the notes through his jawbone. He also wrote down his music very carefully, using differentsymbols and instructions to indicate the dynamics, tempo, articulation, andexpression of the music. He even wrote down the pitch range of each instrument andvoice part, so that he could make sure they were balanced and harmonious.He composed some of his best worksafter he became deaf, like the late string quartets, the Missa Solemnis, andthe final piano sonatas. These works are very complex and innovative, showing hismastery of musical forms and styles.They also express his emotions and ideasvery powerfully, showing his struggle with his deafness and his faith inhumanity.Despite hisdeafness, or maybe because of it, he created some of the most beautiful andinspiring music ever. Q4 Whatis something electrical engineers know that others don't? A4 HiteshMohan,6 years of experience as an electrical engineer Jan 12 A fallen power transmission line is extremely dangerous Whenever we encounter a fallen power transmission line orlive wire, there is a tendency to approach it. Somepeople mistakenly believe that it poses no harm as long as they don't touch thewire, but this assumption is incorrect. It is always better to maintain a distance of 8m to 10m from a fallen power line because even though you are not physicallytouching it, afallen power line can still electrocute you. When a fault or accident occurs in a high-voltage system andif the overhead transmission line makes contact with the ground, it can create a voltagegradient in the ground in the form of ripples. As shown below :-If a person's feet are at different points along this gradient, apotential difference can exist between their feet. This potential difference can result in a current flowing through theperson's body, potentially leading to electric shock and death of a person. This phenomenon is called as Step Potential To avoid electric shock when encountering a fallentransmission line, maintain a distance of 6 to 8 meters from the power line. Alternatively, keep your feet as close together as possible to prevent the creation of apotential difference between them. Never touch or gonear an electrical fence:- If a person comes into contact with a conductive object (suchas a fence or equipment) that is at a different potential due to a groundfault, there is a potential for electric shock as shown in the above image.This is called as touchpotential. Touch potential is concerned with the voltage differencebetween the point of contact and the ground at a different potential. It maycause severe damage to Your body. Both Step & Touch potentials are Potential Hazards forthe human body. My note- Though what is told is a simple fact, I don’t recollectstudying about touch potential in the Bsc study. I don’t know it is fading memory at 80, what isstudio in 20’s. Howeverwe must wear nonearthing foot wear and grading potential will notmuch effect us. However if we see a bare ware from electric pole has fallen onearth, if not wearing non earthing footwear,wemust keep our feet as close as possible. Non earthing footware is a dryfootwear and not having any nails fittedon it. Only pastes. Q5 Whatare some funny mathematics jokes? A5 SundararajanSeshadri, Love Mathematics6h I came across this joke a few decades back. Sorry, if it isalready posted. A technician was givena problem: a nail was driven fully in a wall. He had to remove the nail. Hescooped the material around the head and got some hold on the nail head. Using a pliers, he pulled thenail out. The same problemwas given to a mathematician but this time, the nail was not driven fully in. The nail head was exposed with somebody portion outside the wall. The mathematician was aware of the technician’ssolution. He thought for aminute and then drove the nail fully in. And he declared: ‘Now the problem hasbeen converted to a standard one the solution for which already exists!’ -- You received this message because you are subscribed to the Google Groups "Thatha_Patty" group. 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