Dear Mr Sekar,
Thank you very much for reading the QA and responding.
GOPALAKRISHNAN
On Wednesday, 31 January, 2024 at 01:27:38 am IST, Rajaram Krishnamurthy
<[email protected]> wrote:
Q1 and Q4 are repeated KR IRS 30124
On Tue, 30 Jan 2024 at 09:56, Narayanaswamy Sekar <[email protected]> wrote:
---------- Forwarded message ---------
From: 'N Sekar' via iyer123 <[email protected]>
Date: Tue, Jan 30, 2024, 9:17 PM
Subject: [iyer123] Re: [KeralaIyers] CULTURAL QA 01-2024-30A
To: <[email protected]>, Iyer <[email protected]>, Gopa4411
<[email protected]>
Thanks.
Like you said Q 1 answer was very interesting and informative.
Q 5 joke was very good. Hearing it for the first time.
N Sekar
Sent from Yahoo Mail on Android
On Tue, Jan 30, 2024 at 8:33 PM, 'gopala krishnan' via
KeralaIyers<[email protected]> wrote:
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!’
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