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Sharpen Your General Knowledge
Shamim Ansary:
Why Do We Have Fingerprints and What Beneficial Purpose Have Human Fingerprints Evolved to Serve?
Fingerprints help us in gripping and handling objects in a variety of conditions.
They work on the same principle as the tires of a car.
While smooth surfaces are fine for gripping in a dry environment, they are useless in a wet one.
So we have evolved a system of troughs and ridges, to help channel the water away from the fingertips, leaving a dry surface which allows a better grip.
The unique pattern is merely a useful phenomenon that is used by the police to identify individuals.
Fingerprints are the visible parts of rete ridges, where the epidermis of the skin dips down into the dermis, forming an interlocking structure, similar to interlaced fingers.
These protect against shearing, or sideways stress, which would otherwise separate the two layers of skin and allow fluid to accumulate in the space, and form a blister.
They appear on skin surfaces which are subject to constant shearing stress, such as fingers, palms, toes and heels.
The unique patterns are simply due to the semi-random way in which the ridges and the structures in the dermis grow.
Shamim Ansary:
Why Do We Have Fingerprints and What Beneficial Purpose Have Human Fingerprints Evolved to Serve?
Fingerprints help us in gripping and handling objects in a variety of conditions.
They work on the same principle as the tires of a car.
While smooth surfaces are fine for gripping in a dry environment, they are useless in a wet one.
So we have evolved a system of troughs and ridges, to help channel the water away from the fingertips, leaving a dry surface which allows a better grip.
The unique pattern is merely a useful phenomenon that is used by the police to identify individuals.
Fingerprints are the visible parts of rete ridges, where the epidermis of the skin dips down into the dermis, forming an interlocking structure, similar to interlaced fingers.
These protect against shearing, or sideways stress, which would otherwise separate the two layers of skin and allow fluid to accumulate in the space, and form a blister.
They appear on skin surfaces which are subject to constant shearing stress, such as fingers, palms, toes and heels.
The unique patterns are simply due to the semi-random way in which the ridges and the structures in the dermis grow.
Shamim Ansary:
Why Do We Have Fingerprints and What Beneficial Purpose Have Human Fingerprints Evolved to Serve?
Fingerprints help us in gripping and handling objects in a variety of conditions.
They work on the same principle as the tires of a car.
While smooth surfaces are fine for gripping in a dry environment, they are useless in a wet one.
So we have evolved a system of troughs and ridges, to help channel the water away from the fingertips, leaving a dry surface which allows a better grip.
The unique pattern is merely a useful phenomenon that is used by the police to identify individuals.
Fingerprints are the visible parts of rete ridges, where the epidermis of the skin dips down into the dermis, forming an interlocking structure, similar to interlaced fingers.
These protect against shearing, or sideways stress, which would otherwise separate the two layers of skin and allow fluid to accumulate in the space, and form a blister.
They appear on skin surfaces which are subject to constant shearing stress, such as fingers, palms, toes and heels.
The unique patterns are simply due to the semi-random way in which the ridges and the structures in the dermis grow.
Shamim Ansary:
How Does a Camera Lens Create an Image On the Sensor?
The diagram below shows what would happen if there were three pinholes, each creating an inverted reproduction of the object.
Now, if a converging lens is placed just behind the pinholes it will bend the rays going through it. If the focal length of the lens and the distance between the lens and screen are chosen correctly, then the three reproductions from the pinholes will all be at the same location.
Light rays from the top of the object will converge on the appropriate point on the image. Note that the image is inverted and the same size as the reproductions. What would happen if you had a multitude of pinholes at the location of the lens? The reproductions from all the pinholes would be at the same location, and many more rays from the object would end up at the same place on the image.
The image would be much brighter. So, you can model the formation of an image by a lens as a collection of reproductions of pinholes. The larger the lens, the brighter the image.
Shamim Ansary:
What Is Soil Made of and How Is It Formed?
Soil is generally made up of many different minerals, elements, and organic matter.
The dirt of different areas has specific components—such as aluminum, iron, quartz, sand, acid, or salt—which is why some plants grow better in some places than in others.
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