YOUTUBE VIDEO DOWNLOADER OF “If superpowers were real-Super strength”

If you wake up one morning with 1,000 times the strength you had the night before, how will you handle delicate day-to-day tasks? Today, the video will tell the detail and you can use youtube video downloader to download this video from youtube.

If superpowers were real-Super strength

Everything must seem so fragile to you since the scale of your strength has expanded one thousand times.

You’d have to be very careful when you’re shaking someone’s hand, so you don’t end up breaking their bones or crushing everyone you hug. And using a fork to pick up a piece of broccoli from a Styrofoam plate without driving the fork through the plate is going to be as difficult as brain surgery.

Say the day comes and you get the chance to save a damsel in distress falling from a helicopter. So, you hold out your arms,
hoping to catch her. Seconds later, you will find yourself holding her lifeless body.

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What happened? Well, pressure is force divided by area. The smaller the area, the bigger the pressure. This is why we can lift heavy objects without breaking our skin, but a tiny needle can make us bleed with just a little poke.

The pressure that will be exerted on her body can be calculated by force divided by the area on the top of your arms that comes in contact with her. It doesn’t matter if your arms are strong enough
to catch her body without breaking your bones.

Her spine is not strong enough to be caught by you without being damaged. Even if you rip off the nearest door to provide a bigger
area to catch her with, you still wouldn’t be able to save her anyway.
Remember, it’s not the fall that kills her, but the sudden stop at the bottom.

Let’s say she’s falling from a 32 story building, about 300 feet, and you are 6 feet tall, maybe 10 feet on your tippy-toes, with your arms above your head holding a door, in hopes of distributing the pressure
across a larger surface area, but all you’re doing is essentially moving the ground up by 10 feet.

So, she’s now falling from 290 feet, instead of 300 feet, reaching the speed of 173 feet per second just before impact, not counting air resistance. It’s the equivalent of crashing at 94 miles per hour
into a wall with a door in front of it.

The only thing that could save her is flying. But that power comes with its own host of scientific issues. If you could fly, what you must do is fly up to her, start flying down at the speed she is falling,
hold on to her, then gradually slow down until you come to a complete stop.

This process requires a lot of cushion space between the point she starts falling and the ground. Every second you waste on changing into your superhero costume and flying up to her height, her head is getting that much closer to the pavement!

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If she’s falling from a high place, and you can’t get to her until she’s only a few feet above the ground, there’s really nothing you can do other than magically turn the pavement into marshmellow to allow her enough time to slowly come to a stop. Then, break out the chocolate and graham crackers and you’ve got s’ mores. Mmmm, delicious!

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YOUTUBE VIDEO DOWNLOADER OF “What is the Uncertainty Principle”

Quantum mechanics is weird, right? But did you know that some of its supposed peculiarities are not unique to quantum physics but are just properties of waves in general?  The following video will tell what is it and you can use a youtube video downloader to download this video from youtube.

What is the Uncertainty Principle

Take the uncertainty principle – it says that the better we know where a particle is, the less we know about how fast it’s going.
There’s a limit to how much we can know! But this isn’t just quantum weirdness – it happens all the time with normal everyday
waves!

Remember that the frequency of a wave is how close the wave crests are to each other – a low-frequency wave doesn’t have nearly as much oomph as a high-frequency one! And the position of a wave is… well, where the wave is… mostly.

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So where exactly is a wave? It’s spread out everywhere, right?
Ok, but for a wave pulse, it’s pretty easy to see where the wave is.
So now that we know where the pulse is, what’s it’s frequency?
Well, a localized pulse doesn’t really “wave”, so we can’t measure the frequency of its crests!

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And that’s the uncertainty principle in a nutshell – you can either know where a wave is or where it’s going, but not both at the same time!

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YOUTUBE VIDEO DOWNLOADER OF “Why Do Rivers Curve”

Compared to the whitewater streams that tumble down mountainsides, the meandering rivers of the plains may seem tame and lazy. Today, the video will tell the detail and you can use youtube video downloader to download this video from youtube.

Why Do Rivers Curve

But mountain streams are corralled by the steep-walled valleys they carve – their courses are literally set in stone. Out on the open plains, those stony walls give way to soft soil, allowing rivers much more freedom to shift their banks and set their own ever-changing courses to the sea: courses that almost never run straight.

At least not for long, because all it takes to turn a straight stretch of river into a bendy one is a little disturbance and a lot of time  – and in nature, there’s plenty of both.

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     Say, for example, that a muskrat burrows herself a den in one bank of a stream. Her tunnels make for a cozy home,  but they also weaken the bank, which eventually begins to crumble and slump into the stream. Water rushes into the newly-formed hollow, sweeping away loose dirt and making the hollow even hollower, which lets the water rush a little faster and sweep away a little more dirt from the bank…and so on, and so on.

As more of the stream’s flow is diverted into the deepening hole on one bank and away from the other side of the channel, the flow there weakens and slows. And since slow-moving water can’t carry
the sand-sized particles that fast-moving water can, that dirt drops to the bottom and builds up to make the water there shallower
and slower, and then keeps accumulating until the edge of the stream becomes new land on the inside bank.

     Meanwhile, the fast-moving water near the outside bank sweeps out of the curve with enough momentum to carry it across the channel and slam it into the other side, where it starts to carve another curve. And then another, and then another, and then another.

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The wider the stream, the longer it takes the slingshotting current to reach the other side, and the greater the downstream distance to the next curve. In fact, measurements of meandering streams all over the world reveal a strikingly regular pattern: the length of one S-shaped meander tends to be about six times the width of the channel. So little tiny meandering streams tend to look just like miniature versions of their bigger relatives.

As long as nothing gets in the way of a river’s meandering, its curves will continue to grow curvier and curvier until they loop around and bumble into themselves. When that happens, the river follows the straighter path downhill, leaving behind a crescent-shaped remnant called an oxbow lake. Or a billabong. Or a lago en Herradura. Or a bras mort …

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We have lots of names for these lakes, since they can occur pretty much anywhere liquid flows – which brings up an interesting question: what do the Martians call them?

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YOUTUBE DOWNLOADER VIDEO OF “Why Do Animals Eat Their Babies”

Why do animals eat their babies? The following video will tell you detail. You can use youtube downloader to collect the video.

WHY DO ANIMALS EAT THEIR BABIES

Sometimes, a hamster mom looks at her adorable little babies and is like, ‘I just want to gobble you up’—except not in a cute way…more
in an “I’m ACTUALLY ABOUT TO EAT YOU” way.

Hamster moms are not alone—pigs, bugs, birds, snakes, primates, and fish all occasionally nom on the next generation. Which is weird.
Not just because we humans consider it deeply wrong to eat our own babies, but also because making babies is the primary goal of virtually all life, so eating them, and the genes they carry, seems like the ultimate act of self-defeat.

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But self-defeating impulses have a pretty straightforward way of dying out, so the fact that species across the animal kingdom occasionally cannibalize their young suggests that it can sometimes be a successful strategy. For instance, hamsters appear to use baby-eating as a form of crowd control: females with litters of 8 or 9 pups eat two of them, on average.

And when scientists have tried adding a couple pups to the litter, the hamster moms eat four. But removing a few pups the day they’re born pretty much stops the cannibalism before it starts—suggesting that a hamster mom eats her young to keep her litter small enough
that she can provide for the survivors and ensure they grow up to pass on their genes.

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Other critters, like the Long-tailed Sun Skink, chow down on their babies only in emergencies. When predators repeatedly threaten to eat the mother’s eggs, she beats them to it and eats them all herself.
Which actually makes sense: if the eggs are doomed to become someone’s lunch, making them HER lunch helps prepare the mama skink for another round of reproduction. And sometimes, kids, you know, get in the way, so they have to go.

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The male sand goby fertilizes eggs from multiple females over a short period of time and cares for them all together in one nest.
In order to mate again, he has to wait for all his eggs to hatch, so he sacrifices the slowpokes to free himself up for more baby-making.
In short, for critters across the animal kingdom to maximize the resources, energy, and opportunities they need to pass on their genes, sometimes it does make sense to order off of the kid’s menu.

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YOUTUBE VIDEO DOWNLOADER OF “What is Dark Matter”

Have you ever had the feeling that there’s something bigger out there, something you can’t see? Well, there is – it’s called Dark Matter.  Today, the video will tell the detail and you can use youtube video downloader to download this video from youtube.

What is Dark Matter

Dark matter is spread throughout space, engulfing the Milky Way and all other galaxies. It’s four times more common in the universe
than visible matter, yet we’ve never seen or directly observed it!
So how do we know it’s there?

Because of gravity. A galaxy is like a giant merry-go-round that all the stars are riding. In order to stay on, each star has to hold on tight (that’s where gravity comes in), otherwise it’ll fly off into space.

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The problem is, the force of gravity from all the stars we can see isn’t strong enough to hold galaxies together – all the stars should be flying off the edge of the merry-go-round! But they’re not. It’s as if some invisible rope is helping them hold on.

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Physicists believe that rope is the gravitational force from stuff we can’t see – hence, Dark Matter. And how do we know the speeds of stars in distant galaxies?

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The doppler effect (which is why a police siren shifts to a lower pitch as the car passes) also works for light – that’s how radar catches you speeding, and how astronomers measure the rotation of galaxies.
So, we use what we can see to tell us about what we can’t.

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YOUTUBE VIDEO DOWNLOADER OF”How the Sun works-Fusion and Quantum Tunneling”

Did you know that if the sun were fueled by combustion of, say, gasoline or wood, it would burn out in just a few millennia? The following video will give you detail. Now, you can use youtube video downloader to download this video from youtube.


So how is it still here after 4.5 billion years? Physics. The sun is like a big nuclear submarine… in the sky. That’s right – it’s fueled by nuclear reactions that fuse hydrogen atoms together into helium
and other heavier elements, releasing huge amounts of energy in the process.

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In this way, the sun is slowly converting its mass into energy – in the form of sunlight! And it has more than enough fuel to last billions
of years. But nuclear fusion’s no walk in the park – on earth we need to heat hydrogen up 100x hotter than the sun to get a fusion reaction.

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So how does the sun do it? Quantum tunneling. There’s a small chance (which I’ll explain later) that hydrogen atoms, even if they aren’t quite hot enough for fusion, will fuse together anyway.

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And the sun is SO big and has so much hydrogen that these small chances happen all the time, and that’s what keeps the sun energized! So when the sun shines tomorrow, give thanks
to quantum mechanics.

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best YOUTUBE VIDEO DOWNLOADER OF “What is Gravity”

We’re all familiar with gravity as “the reason objects fall”, but there’s much, much more to gravity than that.   The following video will tell what is it and you can use a youtube video downloader to download this video from youtube.

WHAT IS GRAVITY

Gravity is a long-range attractive force between all objects with mass: it’s what keeps us from falling off the earth, it’s what keeps the earth in orbit around the sun, and it’s what caused the sun itself to form four and a half billion years ago!

It’s amazing to think that every massive object attracts every other in the universe – that means that your dog, the earth, and a black hole in the Andromeda galaxy 2.5 million light-years away are all gravitationally attracted to you, and you to them. In the 17th century, Isaac Newton discovered that the strength of the gravitational force decreases by the square of the distance between
two objects – so if you’re twice as far away, gravity is only one fourth as strong!

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He also discovered that the strength of gravity is proportional to the mass of the objects in question: the more massive an object, the stronger the gravitational force. That’s why we can all feel the Earth pulling on us, but don’t really notice the pull of the moon – it’s smaller, and farther away! (the moon’s gravity is strong enough to cause the tides, though!) And when I said earlier that gravity is an
attraction between objects with mass, I lied.

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I meant objects with Energy. Because in addition to massive objects, gravity also attracts light and other massless (but energetic) articles, so that a photon of light can be bent slightly passing the sun,
or trapped completely by a black hole. Now, do you understand the gravity of the situation?

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YOUTUBE VIDEO DOWNLOADER OF “Is it Better to Walk or Run in the Rain”

 Today, we can use youtube video downloader to download a video from youtube which is about on those cold, rainy days when you forget your rain jacket or umbrella, and you want to stay as dry as possible… should you walk and spend more time in the rain? Or should you run, which means you’ll be smashing into more raindrops from the side?

IS IT BETTER TO WALK OR RUN IN THE RAIN

Assuming you haven’t been fully soaked yet and you aren’t jumping into puddles, the answer is simple. As you move out of the way of one falling raindrop, you move into the way of another. So the amount of rain hitting the top of you is constant, regardless of how fast you’re going. Alternatively, you can picture that the raindrops themselves are stationary and you (and the earth beneath you) are moving upwards through the rain!

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And since the volume of a parallelepiped (that’s a 3D parallelogram) doesn’t depend at all on its slant, then no matter how fast you’re
moving horizontally the same amount of rain will land on top of you each second.


Now, if you’re not moving, the rain from the top is all you’ll get. But if you ARE moving, you’ll also run into raindrops from the side
and you’ll get wetter. So in any given second, you stay driest by standing still, and the faster you move the wetter you become.


But if you’re trying to get from point A to point B, then standing still won’t do you much good. And en route from point A to point B, the total amount of rain you run into from the side has nothing to do with how fast you’re going – just like how a snowplow will plow
the same amount of snow from a stretch of road regardless of the exact speed it drives.


In the case of running through the rain, you can figure that out using parallelepipeds again. So over a given period of time, the same amount of rain will hit you from the top, regardless of how fast you’re going. And over a given distance, you’ll hit the same amount of rain from the side – again, regardless of how fast you’re going.
So your total wetness is equal to the wetness per second for rain from the top times the amount of time you spend in the rain, plus
the wetness per meter for rain from the side times the number of meters you travel.

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So to stay driest getting from one point to another, you should try to minimize the amount Of water falling onto you from above. And
quite simply, that means getting out of the rain as fast as possible.

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YOUTUBE VIDEO DOWNLOADER OF “Would you opt for a life with no pain?”

Imagine if you could plug your brain into a machine that would bring you ultimate pleasure for the rest of your life. If you were given the choice to sign up for that kind of existence, would you? Today, the video will give the detail and you can use youtube video downloader to download from youtube.

WOULD YOU OPT FOR A LIFE WITH NO PAIN?

That’s the question philosopher Robert Nozick posed through a thought experiment he called the Experience Machine. The experiment asks us to consider a world in which scientists have developed a machine that would simulate real-life while guaranteeing experiences of only pleasure and never pain.

The catch? You have to leave reality behind permanently, but you’ll hardly know the difference. Your experiences will be indistinguishable from reality. Life’s natural ups and downs will just be replaced with an endless series of ups. Sounds great, right?

It may seem like a tempting offer, but perhaps it’s not as ideal as it sounds. The experiment was actually designed to refute a philosophical notion called hedonism. According to hedonists,
maximizing net pleasure is the most important thing in life
because pleasure is the greatest good that life has to offer.

For hedonists, the best choice that a person could make for himself
is one that brings him the greatest possible amount of pleasure while bringing him no pain. Limitless pleasure minus zero pain
equals maximum net pleasure, or in other words, the exact scenario the Experience Machine offers.

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Therefore, if hedonism is your philosophy of choice, plugging in would be a no-brainer. But what if there’s more to life than just pleasure? That’s what Nozick believed he was demonstrating
through his Experience Machine thought experiment.

Despite the machine’s promise of maximum net pleasure, he still found reason, not to plugin, as do many other experimenters who consider the proposition. But what could possibly dissuade us from
choosing a future of ultimate pleasure?

Consider this scenario. Betsy and Xander are in a loving, committed relationship. Betsy is head over heels and has never felt happier.
However, unbeknownst to Betsy, Xander has been romancing
her sister, Angelica, with love letters and secret rendezvous for the duration of their relationship.

If Betsy found out, it would destroy her relationships with both Xander and Angelica, and the experience would be so traumatic,
she would never love again. Since Betsy is in blissful ignorance
about Xander’s infidelity, hedonists would say she’s better off
remaining in the dark and maintaining her high level of net pleasure.
As long as Betsy never finds out about the relationship, her life is guaranteed to go on as happily as it is right now.

So, is there value in Besty knowing the truth of her situation? Imagine if you were Betsy. Would you prefer to know the truth?
If the answer is yes, you’d be choosing an option that sharply decreases your net pleasure.

Perhaps, then, you believe that there are things in life with greater intrinsic value than pleasure. Truth, knowledge, authentic connection with other human beings. These are all things
that might make the list.

By never learning the truth, Betsy is essentially living life in her own personal Experience Machine, a world of happiness that’s not based in reality. This love triangle is an extreme example, but it mirrors many of the decisions we make in day to day life.

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So whether you’re making a choice for Betsy or for yourself, why might you feel reality should be a factor? Is there inherent value in real experiences, whether pleasurable or painful? Do you yourself have more value when you’re experiencing real life’s pleasures and pains? Nozick’s experiment may not provide all the answers, but it forces us to consider whether real life, though imperfect, holds some intrinsic value beyond the pleasure of plugging in.

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YOUTUBE VIDEO DOWNLOADER OF “Mary’s Room: A philosophical thought experiment”

This is a thought-provoking thought experiment: mary’s room.  the following video will tell what is it and you can use a youtube video downloader to download this video from youtube.

mary’s room

Imagine a brilliant neuroscientist named Mary. Mary lives in a black and white room, she only reads black and white books, and her screens only display black and white.

But even though she has never seen color, Mary is an expert in color vision and knows everything ever discovered about its physics and biology. She knows how different wavelengths of light stimulate three types of cone cells in the retina, and she knows how electrical signals travel down the optic nerve into the brain.

There, they create patterns of neural activity that correspond to the millions of colors most humans can distinguish. Now imagine that one day, Mary’s black and white screen malfunctions and an apple appears in color.

mary's room

For the first time, she can experience something that she’s known about for years. Does she learn anything new? Is there anything about perceiving color that wasn’t captured in all her knowledge?
Philosopher Frank Jackson proposed this thought experiment,
called Mary’s room, in 1982.

He argued that if Mary already knew all the physical facts about color vision, and experiencing color still teaches her something new,
then mental states, like color perception, can’t be completely described by physical facts.

The Mary’s room thought experiment describes what philosophers call the knowledge argument, that there are non-physical properties
and knowledge which can only be discovered through conscious experience.

The knowledge argument contradicts the theory of physicalism,
which says that everything, including mental states, has a physical explanation. To most people hearing Mary’s story, it seems intuitively obvious that actually seeing color will be totally different than learning about it.

Therefore, there must be some quality of color vision that transcends its physical description. The knowledge argument isn’t just about color vision. Mary’s room uses color vision to represent conscious experience. If physical science can’t entirely explain color vision, then maybe it can’t entirely explain other conscious experiences either.

For instance, we could know every physical detail about the structure and function of someone else’s brain, but still not understand what it feels like to be that person. These ineffable experiences have properties called qualia, subjective qualities that you can’t accurately describe or measure.

Qualia are unique to the person experiencing them, like having an itch, being in love, or feeling bored. Physical facts can’t wholly explain mental states like this. Philosophers interested in artificial intelligence have used the knowledge argument to theorize that recreating a physical state won’t necessarily recreate a corresponding mental state.

In other words, building a computer which mimicked the function of every single neuron of the human brain won’t necessarily create a conscious computerized brain. Not all philosophers agree that Mary’s room experiment is useful. Some argue that her extensive knowledge would have allowed her to create the same mental state
produced by actually seeing the color.

The screen malfunction wouldn’t show her anything new. Others say that her knowledge was never complete in the first place because it was based only on those physical facts that can be conveyed in words. Years after he proposed it, Jackson actually reversed his own stance on his thought experiment.

He decided that even Mary’s experience of seeing red still does correspond to a measurable physical event in the brain, not unknowable qualia beyond physical explanation. But there still isn’t a definitive answer to the question of whether Mary would
learn anything new when she sees the apple.

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Could it be that there are fundamental limits to what we can know
about something, we can’t experience? And would this mean there are certain aspects of the universe that lie permanently beyond our comprehension? Or will science and philosophy allow us to overcome our mind’s limitations?

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