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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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How much water can a camel store in its hump?
Camels do not store water in their humps. Instead, camels use the humps to store energy-rich fat deposits. Many animals, including humans, use body fat as an energy storage.
Unique to a camel, however, is the fact that it stores the fat in a hump up on top instead of around the belly or limbs. It does this to stay cool. Fat has a natural tendency to insulate heat, acting like a blanket to bodies that are covered in fat. Being a hot-climate animal, a camel would waste energy trying to cool down if its fat were wrapped around its body.
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How much water can a camel store in its hump?
Camels do not store water in their humps. Instead, camels use the humps to store energy-rich fat deposits. Many animals, including humans, use body fat as an energy storage.
Unique to a camel, however, is the fact that it stores the fat in a hump up on top instead of around the belly or limbs. It does this to stay cool. Fat has a natural tendency to insulate heat, acting like a blanket to bodies that are covered in fat. Being a hot-climate animal, a camel would waste energy trying to cool down if its fat were wrapped around its body.
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How do flies walk on the ceiling?
Flies can walk upside down! They can do this because of their sticky feet.
A fly has foot pads that are covered in tacky glue.
To unstick their feet so they can walk anywhere, the fly uses tiny foot claws to push or twist themselves away.
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How do flies walk on the ceiling?
Flies can walk upside down! They can do this because of their sticky feet.
A fly has foot pads that are covered in tacky glue.
To unstick their feet so they can walk anywhere, the fly uses tiny foot claws to push or twist themselves away.
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Why does evolution always lead to more advanced species?
Evolution does not always lead to more advanced species. Evolution is simply a description of the way change occurs in biological creatures over many generations in order to better exploit a certain environment.
Evolution sometimes leads to progress, but it sometimes leads in the opposite direction.
For instance, the Texas blind salamander has lost his eyes after many generations of evolution due to the uselessness of eyes in the dark caves where he dwells. As reported by biologist David M. Hillis, these salamanders have successfully adapted to their environment by loosing their eyes. But going blind does not seem to be much in the way of progress from a global perspective.
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Why does evolution always lead to more advanced species?
Evolution does not always lead to more advanced species. Evolution is simply a description of the way change occurs in biological creatures over many generations in order to better exploit a certain environment.
Evolution sometimes leads to progress, but it sometimes leads in the opposite direction.
For instance, the Texas blind salamander has lost his eyes after many generations of evolution due to the uselessness of eyes in the dark caves where he dwells. As reported by biologist David M. Hillis, these salamanders have successfully adapted to their environment by loosing their eyes. But going blind does not seem to be much in the way of progress from a global perspective.
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How do icebergs lose their salt?
Icebergs do not have any salt to begin with. Icebergs are not pieces of frozen ocean water. Rather, icebergs are frozen chunks of fresh water that began their life on land. It all starts when snow falls in a region of land that is too cold for the snow to melt.
Over time, the non-salty snow builds up on the ground. Without temperatures warm enough to melt the snow, it piles up so high that it starts to crush under its own weight. The crushing force of gravity fuses the non-salty snow crystals into a giant slab of non-salty ice known as a glacier. This process is very slow and takes a long time. Gravity not only pulls the snow down into the ice, it also pulls the ice downhill.
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How do icebergs lose their salt?
Icebergs do not have any salt to begin with. Icebergs are not pieces of frozen ocean water. Rather, icebergs are frozen chunks of fresh water that began their life on land. It all starts when snow falls in a region of land that is too cold for the snow to melt.
Over time, the non-salty snow builds up on the ground. Without temperatures warm enough to melt the snow, it piles up so high that it starts to crush under its own weight. The crushing force of gravity fuses the non-salty snow crystals into a giant slab of non-salty ice known as a glacier. This process is very slow and takes a long time. Gravity not only pulls the snow down into the ice, it also pulls the ice downhill.
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Why does a magnetic compass point to the Geographic North Pole?
A magnetic compass does not point to the geographic north pole. A magnetic compass points to the earth's magnetic poles, which are not the same as earth's geographic poles.
Furthermore, the magnetic pole near earth's geographic north pole is actually the south magnetic pole. When it comes to magnets, opposites attract. This fact means that the north end of a magnet in a compass is attracted to the south magnetic pole, which lies close to the geographic north pole.
Magnetic field lines outside of a permanent magnet always run from the north magnetic pole to the south magnetic pole. Therefore, the magnetic field lines of the earth run from the southern geographic hemisphere towards the northern geographic hemisphere.
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Why does a magnetic compass point to the Geographic North Pole?
A magnetic compass does not point to the geographic north pole. A magnetic compass points to the earth's magnetic poles, which are not the same as earth's geographic poles.
Furthermore, the magnetic pole near earth's geographic north pole is actually the south magnetic pole. When it comes to magnets, opposites attract. This fact means that the north end of a magnet in a compass is attracted to the south magnetic pole, which lies close to the geographic north pole.
Magnetic field lines outside of a permanent magnet always run from the north magnetic pole to the south magnetic pole. Therefore, the magnetic field lines of the earth run from the southern geographic hemisphere towards the northern geographic hemisphere.
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Galaxies look stationary, so why do scientists say that they rotate?
Galaxies do indeed rotate. This rotation is what gives typical galaxies a flattened round shape, a bit like how throwing and spinning pizza dough makes it round and flat. In terms of the tangential speed of its parts, galaxies rotate at an incredibly high speed.
For instance, our entire solar system speeds along at about 500,000 miles per hour as it takes part in the galaxy's rotation.
So why do galaxies look so frozen in place if their parts are moving so quickly? It's because galaxies are unimaginably huge. An object traveling at high speed across a very long distance appears to be moving slowly when viewed from far away. This is not a psychological effect. The object is actually traveling very slowly when its speed is expressed in terms of the percentage of the total distance it has to travel.
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Galaxies look stationary, so why do scientists say that they rotate?
Galaxies do indeed rotate. This rotation is what gives typical galaxies a flattened round shape, a bit like how throwing and spinning pizza dough makes it round and flat. In terms of the tangential speed of its parts, galaxies rotate at an incredibly high speed.
For instance, our entire solar system speeds along at about 500,000 miles per hour as it takes part in the galaxy's rotation.
So why do galaxies look so frozen in place if their parts are moving so quickly? It's because galaxies are unimaginably huge. An object traveling at high speed across a very long distance appears to be moving slowly when viewed from far away. This is not a psychological effect. The object is actually traveling very slowly when its speed is expressed in terms of the percentage of the total distance it has to travel.
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What keeps the sun spinning?
Nothing keeps the sun spinning. The sun spins under its own inertia and does not need any help to keep it going. Isaac Newton observed that objects in motion tend to stay in motion. This is called the Law of Inertia. It means that if an object is already moving and nothing acts on it to stop it, the object will just keep moving under its own inertia.
For instance, a hockey puck sliding across the parking lot will only stop if it hits a wall or if there is enough friction acting on it to slow it down to a stop. Without an external force like friction, the puck will slide forever under its own inertia.
The Law of Inertia is just a conceptual statement. The more general and more mathematical version of the Law of Inertia is called the Law of Conservation of Momentum. It states that the total momentum of an object stays constant if nothing acts on the object.
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What keeps the sun spinning?
Nothing keeps the sun spinning. The sun spins under its own inertia and does not need any help to keep it going. Isaac Newton observed that objects in motion tend to stay in motion. This is called the Law of Inertia. It means that if an object is already moving and nothing acts on it to stop it, the object will just keep moving under its own inertia.
For instance, a hockey puck sliding across the parking lot will only stop if it hits a wall or if there is enough friction acting on it to slow it down to a stop. Without an external force like friction, the puck will slide forever under its own inertia.
The Law of Inertia is just a conceptual statement. The more general and more mathematical version of the Law of Inertia is called the Law of Conservation of Momentum. It states that the total momentum of an object stays constant if nothing acts on the object.
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An egg looks like a crazy jellyfish underwater
A cracked egg on land might make a big mess, but 18 metres (60 feet) below the surface of the ocean, the pressure on the egg is 2.8 times atmospheric pressure, and it holds it all together like an invisible egg shell.
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An egg looks like a crazy jellyfish underwater
A cracked egg on land might make a big mess, but 18 metres (60 feet) below the surface of the ocean, the pressure on the egg is 2.8 times atmospheric pressure, and it holds it all together like an invisible egg shell.
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This is how a Face forms in the Womb
Embryonic development is an incredibly complex process that scientists are still just beginning to understand. But one thing researchers have been able to map out is how the embryo folds to create the structures of the human face in the womb.
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This is how a Face forms in the Womb
Embryonic development is an incredibly complex process that scientists are still just beginning to understand. But one thing researchers have been able to map out is how the embryo folds to create the structures of the human face in the womb.
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There is enough DNA in the average person’s body to stretch from the sun to Pluto and back — 17 times
The human genome (the genetic code in each human cell) contains 23 DNA molecules (called chromosomes), each containing from 500,000 to 2.5 million nucleotide pairs. DNA molecules of this size are 1.7 to 8.5 cm long when uncoiled — about 5 cm on average.
There are about 37 trillion cells in the human body, so if you were to uncoil all of the DNA encased in each cell and place the molecules end to end, it would sum to a total length of 2×1014 meters — enough for 17 Pluto round-trips (the distance from the sun to Pluto and then back again is 1.2×1013 meters).
As an added bonus, you should know that we each share 99% of our DNA with every other human — just to show that we’re far more alike than different.
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There is enough DNA in the average person’s body to stretch from the sun to Pluto and back — 17 times
The human genome (the genetic code in each human cell) contains 23 DNA molecules (called chromosomes), each containing from 500,000 to 2.5 million nucleotide pairs. DNA molecules of this size are 1.7 to 8.5 cm long when uncoiled — about 5 cm on average.
There are about 37 trillion cells in the human body, so if you were to uncoil all of the DNA encased in each cell and place the molecules end to end, it would sum to a total length of 2×1014 meters — enough for 17 Pluto round-trips (the distance from the sun to Pluto and then back again is 1.2×1013 meters).
As an added bonus, you should know that we each share 99% of our DNA with every other human — just to show that we’re far more alike than different.
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Multi-colored holes?
Black holes aren’t black. They’re very dark, sure, but they aren’t black. They glow, slightly, giving off light across the whole spectrum, including visible light. This radiation is called “Hawking radiation” after the former Lucasian Professor of Mathematics at Cambridge University Stephen Hawking, who first proposed its existence.
Because black holes are constantly giving off this radiation, and therefore losing mass, they will eventually evaporate if they don’t have another source of mass to sustain them.
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Multi-colored holes?
Black holes aren’t black. They’re very dark, sure, but they aren’t black. They glow, slightly, giving off light across the whole spectrum, including visible light. This radiation is called “Hawking radiation” after the former Lucasian Professor of Mathematics at Cambridge University Stephen Hawking, who first proposed its existence.
Because black holes are constantly giving off this radiation, and therefore losing mass, they will eventually evaporate if they don’t have another source of mass to sustain them.
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Why are veins blue?
The veins themselves are not blue, but are mostly colorless. It is the blood in the veins that gives them color. Furthermore, the blood in human veins is also not blue. Blood is always red. Blood that has been oxygenated (mostly flowing through the arteries) is bright red and blood that has lost its oxygen (mostly flowing through the veins) is dark red.
Anyone who has donated blood or had their blood drawn by a nurse can attest that deoxygenated blood is dark red and not blue.
The blood in your veins appears blue because you are looking at your veins through layers of skin and fat. Skin scatters a lot of the red portion of white light before it can reflect off the blood, leaving the blue light to reflect off the blood and back to our eyes.
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Why are veins blue?
The veins themselves are not blue, but are mostly colorless. It is the blood in the veins that gives them color. Furthermore, the blood in human veins is also not blue. Blood is always red. Blood that has been oxygenated (mostly flowing through the arteries) is bright red and blood that has lost its oxygen (mostly flowing through the veins) is dark red.
Anyone who has donated blood or had their blood drawn by a nurse can attest that deoxygenated blood is dark red and not blue.
The blood in your veins appears blue because you are looking at your veins through layers of skin and fat. Skin scatters a lot of the red portion of white light before it can reflect off the blood, leaving the blue light to reflect off the blood and back to our eyes.
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How can we unlock the 90% of our brain that we never use?
Healthy humans use all of their brain. There is no part of the brain that goes unused. Certain tasks work certain parts of the brain more, but they all play important roles.
Brain maps, as found in modern anatomy books, indicate that each part of the brain has a specific function essential to a healthy human. If there were a part of your brain that really went unused, then you could safely damage that part in an accident with no ill effects. But decades of medical records show that damage to any part of the brain has severe effects. If 90% of the brain were not used, then 90% of the brain tumors would cause no problem.
This myth was propagated by authors trying to sell books on mystical ways to unlock your hidden potential, claiming that unused brain power could be tapped using the methods in their books.
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How can we unlock the 90% of our brain that we never use?
Healthy humans use all of their brain. There is no part of the brain that goes unused. Certain tasks work certain parts of the brain more, but they all play important roles.
Brain maps, as found in modern anatomy books, indicate that each part of the brain has a specific function essential to a healthy human. If there were a part of your brain that really went unused, then you could safely damage that part in an accident with no ill effects. But decades of medical records show that damage to any part of the brain has severe effects. If 90% of the brain were not used, then 90% of the brain tumors would cause no problem.
This myth was propagated by authors trying to sell books on mystical ways to unlock your hidden potential, claiming that unused brain power could be tapped using the methods in their books.
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Why do mirrors flip left to right and not up to down?
Mirrors do not flip left to right. They flip front to back. Mirrors reflect light rays such that the angle of reflection equals the angle of incidence.
For a three-dimensional object standing in front of the mirror, there is an image of the object created behind the mirror with the right side still on the right, the left side still on the left, the top side still on the top, the bottom side still on the bottom, but the front side is flipped to the back and the back side is flipped to the front.
This can be easily seen by tracing the rays from significant points on the object and seeing where they end up in the mirror image.
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Why do mirrors flip left to right and not up to down?
Mirrors do not flip left to right. They flip front to back. Mirrors reflect light rays such that the angle of reflection equals the angle of incidence.
For a three-dimensional object standing in front of the mirror, there is an image of the object created behind the mirror with the right side still on the right, the left side still on the left, the top side still on the top, the bottom side still on the bottom, but the front side is flipped to the back and the back side is flipped to the front.
This can be easily seen by tracing the rays from significant points on the object and seeing where they end up in the mirror image.
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