Each entry on this list of common misconceptions is worded as a correction; the misconceptions themselves are implied rather than stated. These entries are concise summaries; the main subject articles can be consulted for more detail.
An astronaut orbiting Earth in a spacecraft experiences a condition of weightlessness because both the spacecraft and the astronaut are in free fall.
Mythbusting: Popular myths about the African elephant... Myth: Elephants go to elephant graveyards to die
Of course, dogs sweat. You would, too, if you had to wear a fur coat in hot weather. Dogs excrete moisture through the pads on their paws.
It is another folk tale that dogs do not sweat except through the tongue. This is an incorrect belief as dogs possess sweat glands all over the body.
SOME time ago we received from a correspondent an inquiry as to whether the very prevalent belief that a dog perspires through the tongue was a vulgar error or well founded. ...whether the dog exudes fluid from the tongue of the some kind as that exuded from the human skin. To this question the answer is, No. The skin of the dog is abundantly furnished with glands, having the characteristic disposition and structure of those which in man produce sweat, ... in other words, the dog does not sweat by the tongue.
In the wild, rabbits aren't in the habit of digging up root vegetables such as carrots, potatoes and beets. They much prefer wild greens, such as grasses and clover. In fact, carrots may actually be bad for rabbits, because although the vegetables are high in good nutrients, including beta carotene, they are also relatively high in sugar. This means that feeding a rabbit lots of carrots could lead to tooth decay or other health issues.
Only American frogs are said to go "ribbit," and that's believed to be because early Hollywood producers used the ribbiting sound of the Pacific tree frog during night scenes.
a 1934 book by entomologist Antoine Magnan... refers to a calculation by his assistant André Sainte-Laguë, who was an engineer. The conclusion was presumably based on the fact that the maximum possible lift produced by aircraft wings as small as a bumblebee's wings and traveling as slowly as a bee in flight would be much less than the weight of a bee.
It is known that carnivorous plants can survive without catching prey.
Dinural E-W oscillations of the heads occurred initially but ceased as the flowers opened and anthesis commenced, leaving the heads facing east
One of the best-known fallacies in ECONOMICS is the notion that there is a fixed amount of work to be done – a lump of LABOUR – which can be shared out in different ways to create fewer or more jobs...
Fact: Lightning often strikes the same place repeatedly, especially if it's a tall, pointy, isolated object. The Empire State Building is hit an average of 23 times a year
Although many people might think that males have fewer ribs than females — most likely sparked by the biblical story of Adam and Eve — there is no factual evidence.
[...T]here's little evidence that detox diets actually remove toxins from the body. Indeed, the kidneys and liver are generally quite effective at filtering and eliminating most ingested toxins.
Most parents assume that children plus sugary foods equals raucous and uncontrollable behaviour. ... according to nutrition experts, the belief that children experience a 'sugar high' is a myth.
Few studies have reported the health benefits of vegan diets and therefore no conclusive evidence can be proposed
All published scientific data point to the fact that the G-spot does not exist...
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: CS1 maint: url-status (link)Many people believe that dandruff is caused by poor hygiene, but this is not true.
It's often associated with poor hygiene, but that's a misconception—no one's really sure what causes it.
Dandruff is not caused by poor hygiene, although it may be more obvious if you do not wash your hair regularly.
Part of the process of becoming a mathematics writer is, it appears, learning that you cannot refer to the golden ratio without following the first mention by a phrase that goes something like 'which the ancient Greeks and others believed to have divine and mystical properties.' Almost as compulsive is the urge to add a second factoid along the lines of 'Leonardo Da Vinci believed that the human form displays the golden ratio.' There is not a shred of evidence to back up either claim, and every reason to assume they are both false. Yet both claims, along with various others in a similar vein, live on.
Bernoulli's Principle states that faster moving air has lower pressure... You can demonstrate Bernoulli's Principle by blowing over a piece of paper held horizontally across your lips."
If the lift in figure A were caused by "Bernoulli principle," then the paper in figure B should droop further when air is blown beneath it. However, as shown, it raises when the upward pressure gradient in downward-curving flow adds to atmospheric pressure at the paper lower surface.
...air does not have a reduced lateral pressure (or static pressure...) simply because it is caused to move, the static pressure of free air does not decrease as the speed of the air increases, it misunderstanding Bernoulli's principle to suggest that this is what it tells us, and the behavior of the curved paper is explained by other reasoning than Bernoulli's principle. ... An explanation based on Bernoulli's principle is not applicable to this situation, because this principle has nothing to say about the interaction of air masses having different speeds... Also, while Bernoulli's principle allows us to compare fluid speeds and pressures along a single streamline and... along two different streamlines that originate under identical fluid conditions, using Bernoulli's principle to compare the air above and below the curved paper in Figure 1 is nonsensical; in this case, there aren't any streamlines at all below the paper!
...if a streamline is curved, there must be a pressure gradient across the streamline, with the pressure increasing in the direction away from the centre of curvature.
The curved paper turns the stream of air downward, and this action produces the lift reaction that lifts the paper.
The curved surface of the tongue creates unequal air pressure and a lifting action. ... Lift is caused by air moving over a curved surface.
Demonstrations" of Bernoulli's principle are often given as demonstrations of the physics of lift. They are truly demonstrations of lift, but certainly not of Bernoulli's principle.
As an example, take the misleading experiment most often used to "demonstrate" Bernoulli's principle. Hold a piece of paper so that it curves over your finger, then blow across the top. The paper will rise. However most people do not realize that the paper would NOT rise if it was flat, even though you are blowing air across the top of it at a furious rate. Bernoulli's principle does not apply directly in this case. This is because the air on the two sides of the paper did not start out from the same source. The air on the bottom is ambient air from the room, but the air on the top came from your mouth where you actually increased its speed without decreasing its pressure by forcing it out of your mouth. As a result the air on both sides of the flat paper actually has the same pressure, even though the air on the top is moving faster. The reason that a curved piece of paper does rise is that the air from your mouth speeds up even more as it follows the curve of the paper, which in turn lowers the pressure according to Bernoulli.
Pressure melting cannot be responsible for the low friction of ice. The pressure needed to reach the melting temperature is above the compressive failure stress..."
According to the frequently cited — if incorrect — explanation of why ice is slippery under an ice skate, the pressure exerted along the blade lowers the melting temperature of the top layer of ice, the ice melts and the blade glides on a thin layer of water that refreezes to ice as soon as the blade passes... But the explanation fails... because the pressure-melting effect is small.
Some abilities peak and begin to decline around high school graduation; some abilities plateau in early adulthood, beginning to decline in subjects' 30s; and still others do not peak until subjects reach their 40s or later. These findings motivate a nuanced theory of maturation and age-related decline, in which multiple, dissociable factors differentially affect different domains of cognition.b. Matthews, MEelissa (March 19, 2019). "People's Brains Don't Reach Adulthood Until Age 30, Study Finds". Men's Health.
What we're really saying is that to have a definition of when you move from childhood to adulthood looks increasingly absurd... It's a much more nuanced transition that takes place over three decades.
It's the old myth heard time and again about how people use only ten percent of their brains
It is important to recognize that the potassium content of the body is under strict homeostatic control and is not influenced by variations in environmental levels. For this reason, the dose from 40K in the body is constant.