What countries border the Black Sea?
The Black Sea is an inland sea located between far-southeastern Europe and the far-western edges of the continent of Asia and the country of Turkey. It's bordered by Turkey, and by the countries of Bulgaria, Romania, Ukraine, Russia and Georgia.
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The Black Sea is an inland sea located between far-southeastern Europe and the far-western edges of the continent of Asia and the country of Turkey. It's bordered by Turkey, and by the countries of Bulgaria, Romania, Ukraine, Russia and Georgia.
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How is hair produced and how does it grow?
Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft.
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Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft.
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Hello my friends! It's time to know you better to add some localized content. So where are you from?
You can specify your country in the comment section if not in the list.
You can specify your country in the comment section if not in the list.
Anonymous Poll
54%
India
4%
USA
2%
Russia
4%
Europe
19%
Africa
1%
Australia and New Zealand
2%
North-South-Central American ( except USA)
6%
Middle East Countries( Iran, Iraq, Saudi Arabia etc.)
5%
East Asian Countries( like Indonesia, Thailand, Philippines, Vietnam etc. )
3%
South-East Asian ( except India, like Pakistan, Srilanka, Bangladesh etc)
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What time period are we in?
We are currently living in the Holocene Epoch of the Quaternary Period. In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age and shorter than a period.
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We are currently living in the Holocene Epoch of the Quaternary Period. In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age and shorter than a period.
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Why does the ice float on water while it sinks in alcohol?
The specific gravity of ice is less than that of water but the same is more than that of alcohol, hence ice floats on water but sinks in alcohol.
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The specific gravity of ice is less than that of water but the same is more than that of alcohol, hence ice floats on water but sinks in alcohol.
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Why is mercury used in thermometer?
Mercury is the only metal which is in liquid state even at the ordinary room temperature. Also, it uniformly expands when heated and does not stick to the walls of thermometer. Its high boiling point and low freezing point is the main reason for using it in ordinary thermometers.
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Mercury is the only metal which is in liquid state even at the ordinary room temperature. Also, it uniformly expands when heated and does not stick to the walls of thermometer. Its high boiling point and low freezing point is the main reason for using it in ordinary thermometers.
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Why do the stars twinkle ?
Stars appear to twinkle because its light travels through different layers of space of varying densities. As a result the light from the stars bends and makes them appear to blink on and off.
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Why do the stars twinkle ?
Stars appear to twinkle because its light travels through different layers of space of varying densities. As a result the light from the stars bends and makes them appear to blink on and off.
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How can bats fly in the dark avoiding obstacles?
The ultrasonic waves produced by bats during flying are reflected back when they hit the obstacles. Hence, bats can find their path without any difficulty.
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How can bats fly in the dark avoiding obstacles?
The ultrasonic waves produced by bats during flying are reflected back when they hit the obstacles. Hence, bats can find their path without any difficulty.
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Since gravity is unlimited, can we use it as an infinite energy source?
No, gravity can not be used as an infinite energy source. In fact, strictly speaking, gravity itself can not be used as an energy source at all. You are confusing forces with energy, which are very different things.
Energy is a property of objects, such as balls, atoms, light beams, or batteries. In contrast, forces describe the interaction between objects. Forces are the way that energy is transferred from one object to another when they interact, but forces are not the energy itself. Gravity is a force, so it just provides one way for objects to exchange and transform energy to different states.
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Since gravity is unlimited, can we use it as an infinite energy source?
No, gravity can not be used as an infinite energy source. In fact, strictly speaking, gravity itself can not be used as an energy source at all. You are confusing forces with energy, which are very different things.
Energy is a property of objects, such as balls, atoms, light beams, or batteries. In contrast, forces describe the interaction between objects. Forces are the way that energy is transferred from one object to another when they interact, but forces are not the energy itself. Gravity is a force, so it just provides one way for objects to exchange and transform energy to different states.
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Can a star turn into a planet?
Yes, a star can turn into a planet, but this transformation only happens for a very particular type of star known as a brown dwarf.
Some scientists do not consider brown dwarfs to be true stars because they do not have enough mass to ignite the nuclear fusion of ordinary hydrogen.
At the same time, some scientists do not consider brown dwarfs to be true planets either because they typically sit at the center of a solar system, just like a star.
Read about - Brown Dwarf
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Can a star turn into a planet?
Yes, a star can turn into a planet, but this transformation only happens for a very particular type of star known as a brown dwarf.
Some scientists do not consider brown dwarfs to be true stars because they do not have enough mass to ignite the nuclear fusion of ordinary hydrogen.
At the same time, some scientists do not consider brown dwarfs to be true planets either because they typically sit at the center of a solar system, just like a star.
Read about - Brown Dwarf
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What keeps space empty?
Space is not empty. A point in outer space is filled with gas, dust, a wind of charged particles from the stars, light from stars, cosmic rays, radiation left over from the Big Bang, gravity, electric and magnetic fields, and neutrinos from nuclear reactions.
As the book "Nothingness: The Science of Empty Space" by Dr. Henning Genz describes, space is also filled with two things we can't directly detect: dark matter and dark energy.
Even if all these things could be removed and blocked out from a certain region of space, there would still be three things we could never remove according to Dr. Genz: (1) vacuum energy, (2) the Higgs field, and (3) spacetime curvature.
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What keeps space empty?
Space is not empty. A point in outer space is filled with gas, dust, a wind of charged particles from the stars, light from stars, cosmic rays, radiation left over from the Big Bang, gravity, electric and magnetic fields, and neutrinos from nuclear reactions.
As the book "Nothingness: The Science of Empty Space" by Dr. Henning Genz describes, space is also filled with two things we can't directly detect: dark matter and dark energy.
Even if all these things could be removed and blocked out from a certain region of space, there would still be three things we could never remove according to Dr. Genz: (1) vacuum energy, (2) the Higgs field, and (3) spacetime curvature.
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Can wind travel faster than the speed of sound?
Yes, wind can travel faster than the speed of sound. Wind is just the bulk movement of a mass of air through space and is in principle no different from a train speeding along or a comet zipping through space. The only limitation on the bulk motion of objects with mass is the universal speed limit of the speed of light in vacuum.
The speed of sound is not a fundamental speed like the speed of light is. The speed of sound just describes how fast a mechanical wave travels through a material.
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Can wind travel faster than the speed of sound?
Yes, wind can travel faster than the speed of sound. Wind is just the bulk movement of a mass of air through space and is in principle no different from a train speeding along or a comet zipping through space. The only limitation on the bulk motion of objects with mass is the universal speed limit of the speed of light in vacuum.
The speed of sound is not a fundamental speed like the speed of light is. The speed of sound just describes how fast a mechanical wave travels through a material.
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Can gravity form waves?
Yes, gravity can forms waves. Gravitational waves are ripples in spacetime that travel through the universe.
If you think of gravity as a force acting at a distance, it is difficult to visualize how gravitational waves could form. However, if you use the more accurate description of gravity that was developed by Einstein in his general theory of relativity, these concepts become more logical.
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Can gravity form waves?
Yes, gravity can forms waves. Gravitational waves are ripples in spacetime that travel through the universe.
If you think of gravity as a force acting at a distance, it is difficult to visualize how gravitational waves could form. However, if you use the more accurate description of gravity that was developed by Einstein in his general theory of relativity, these concepts become more logical.
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Listen to the Music 🎶
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Tell us a situation, where this music is fit for that situation. 😀
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Tell us a situation, where this music is fit for that situation. 😀
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Why do humans have an appendix even though it is unnecessary?
The human cecal appendix is not completely unnecessary. In humans, the appendix is a small, dead-end tube that connects to the colon near where the small intestines feeds into the large intestines.
Being a dead-end tube, the appendix can obviously not transport food and waste through the intestinal tract. Furthermore, many people have had their appendix removed and yet seem to suffer no symptoms at all from having no appendix.
This fact may seem to indicate that the appendix is useless; an abandoned evolutionary relict of some ancient predecessor. But the appendix turns out to not be completely useless.
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Why do humans have an appendix even though it is unnecessary?
The human cecal appendix is not completely unnecessary. In humans, the appendix is a small, dead-end tube that connects to the colon near where the small intestines feeds into the large intestines.
Being a dead-end tube, the appendix can obviously not transport food and waste through the intestinal tract. Furthermore, many people have had their appendix removed and yet seem to suffer no symptoms at all from having no appendix.
This fact may seem to indicate that the appendix is useless; an abandoned evolutionary relict of some ancient predecessor. But the appendix turns out to not be completely useless.
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Why do we get headache when hungry?
Calories in food are a measurement of energy. Your body needs a consistent energy source in the form of food as fuel.
If you haven’t had anything to eat in a while, your blood sugar levels can drop. In response, your body releases hormones that signal your brain that you’re hungry. These same hormones may increase your blood pressure and tighten blood vessels in your body, triggering a headache.
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Why do we get headache when hungry?
Calories in food are a measurement of energy. Your body needs a consistent energy source in the form of food as fuel.
If you haven’t had anything to eat in a while, your blood sugar levels can drop. In response, your body releases hormones that signal your brain that you’re hungry. These same hormones may increase your blood pressure and tighten blood vessels in your body, triggering a headache.
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Why do we use a fuse in an electric circuit?
A fuse is used in an electric circuit because when excess current flows through the circuit the fuse melts and breaks the circuit and prevents the damage to any of the electrical goods used.
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Why do we use a fuse in an electric circuit?
A fuse is used in an electric circuit because when excess current flows through the circuit the fuse melts and breaks the circuit and prevents the damage to any of the electrical goods used.
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Why Babies have around 100 more bones than adults?
Babies have about 300 bones at birth, with cartilage between many of them. This extra flexibility helps them pass through the birth canal and also allows for rapid growth. With age, many of the bones fuse, leaving 206 bones that make up an average adult skeleton.
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Why Babies have around 100 more bones than adults?
Babies have about 300 bones at birth, with cartilage between many of them. This extra flexibility helps them pass through the birth canal and also allows for rapid growth. With age, many of the bones fuse, leaving 206 bones that make up an average adult skeleton.
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Can a fire have a shadow?
Yes, you can form the shadow of a fire, but perhaps not for the reason that you are thinking. A shadow is formed any time part of a light beam is blocked or redirected. The shadow region is the region in the light beam where there is less light than in the rest of the beam. This dimmer region tends to take on the shape of the object that is blocking or redirecting some of the light, so we tend to think of a shadow as something that is cast or created by the intercepting object.
With this concept in mind, in order for a fire to have a shadow, the fire needs to somehow block or redirect part of another beam of light.
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Can a fire have a shadow?
Yes, you can form the shadow of a fire, but perhaps not for the reason that you are thinking. A shadow is formed any time part of a light beam is blocked or redirected. The shadow region is the region in the light beam where there is less light than in the rest of the beam. This dimmer region tends to take on the shape of the object that is blocking or redirecting some of the light, so we tend to think of a shadow as something that is cast or created by the intercepting object.
With this concept in mind, in order for a fire to have a shadow, the fire needs to somehow block or redirect part of another beam of light.
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Do blind people dream in visual images?
Yes, blind people do indeed dream in visual images. For people who were born with eyesight and then later went blind, it is not surprising that they experience visual sensations while dreaming.
Dreams are drawn from memories that are stored in the brain as well as from brain circuitry that is developed while experiencing the outside world. Therefore, even though a person who lost his vision may be currently blind, his brain is still able to draw on the visual memories and on the related brain circuits that were formed before he went blind. For this reason, he can dream in visual images.
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Do blind people dream in visual images?
Yes, blind people do indeed dream in visual images. For people who were born with eyesight and then later went blind, it is not surprising that they experience visual sensations while dreaming.
Dreams are drawn from memories that are stored in the brain as well as from brain circuitry that is developed while experiencing the outside world. Therefore, even though a person who lost his vision may be currently blind, his brain is still able to draw on the visual memories and on the related brain circuits that were formed before he went blind. For this reason, he can dream in visual images.
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