We learn about some awesome science in high school – like Einstein’s theory of relativity, the Periodic table, and DNA replication.
The knowledge we pick up there sets the foundations for all the other amazing things we go on to study. But science definitely doesn’t end at high school, and it’s once you take your learning to the next level that things get really interesting.
In no particular order, here are some incredible facts that we didn’t learn at high school, but wish we did. Because I certainly would have paid a whole lot more attention if my teacher had shared a few of these insights in class.
Why are we unable to see through a fostered glass?
When a glass plate is perfectly polished on both the sides, it becomes entirely transparent, allowing light to pass through it. When light can pass through it, you will be able to see through the glass. However, if one side of the glass plate is blasted with sand to get the first glass, the rough surface will scatter all the light in almost all directions.
Therefore, light entering from one side of the glass plate is scattered in all directions, thus not allowing light to pass through it. So, we cannot see through it. If one of the surfaces is mirrored, even then one cannot see through the glass plate. As the surface is reflected, the light will not get scattered, but it will get reflected, and we see a shiny mirror.
2. Why do we become unconscious when hit on the head?
The brain is made up of delicate nerve cells, which are suspended in a cerebrospinal fluid acts as a shock absorber. It is located inside the skull. It controls all our activities. When the head is injured, the brain absorbs the force and results in a total blackout, and the person loses consciousness.
On-regaining the consciousness, the person will be dazed and confused. This condition is called a temporary concussion. However, on receiving a blow, a think frame covering our brain, which is called the dura, will start swelling or bleeding. Then the person may become unconscious as it compresses the brain. This depends on the impact of the hit and the extent of damage done to the brain. This condition is called in succession. Noted symptoms are blurred vision, vomiting, frequent giddiness.
3. What do zig-zag lines in human skull signify?
The skull is made of eight flat bones which are joined closely. These zig-zag lines one finds on the human skull are immovable joints tightly packed between cranial bones which form the human skull. The human skull is made up of eight bones which are joined very tightly. The zig-zag lines one finds over the surface of the human skull are these immovable joints which are exclusively found between the cranial bones which form the human skull. Several types of lines are recognized according to how the margins of bones are united. In some sutures the bones margins overlap, in others, they merge smoothly, while in some the margin interlocks.
4. Name any bird that flies like a helicopter, hovering in the air?
Hummingbird is an example of a bird that flies like a helicopter. Hummingbird’s wings consist mainly of elongated hand bones to which the flight feathers are attached, and the whole side can rotate. The short arm bones allow movement in all directions and can also accommodate the axial rotation through 180 degrees. The tips of the wings can achieve controlled movements. Birds have two sets of muscles which aid in operating the wings.
One set power the downstrokes and the other set provides the upstroke or lifts the wings. A hummingbird has many muscles to lift itself upwards. The angles through which the wings can be rotated and twisted utilizing the big muscles that give the upstroke can convert even the upstroke into a power movement by providing both propulsion and lift.
Thus, the bird can hover in perfectly still air, its quivering wings racing forwards and backwards rather than up and down, the tips of the primary feathers tracing a figure of eight. Every time the beat is reversed, the wings are pivoted through 180 degrees, thus ensuring that the front edge always leads, and on the backstroke, it is always the underside of the flight feathers which are on the top. This means that although backward and forward strokes produce lift the two cancel out each other and leave the bird still on station with no movement. The kingfisher and kestrel are adept at this, but it does not constitute true hovering. Hummingbirds can maintain their hovering in perfectly still air, a feat totally beyond the kestrel which, true to its vernacular name of wind hover, cannot function unless a breeze is flowing, even though this can be so slight that at the ground it may not be noticeable to a human observer.
5. Why do high tension wires produce a humming sound?
Air surrounding the conductors of a high voltage overhead transmission line is usually an insulator. But at extra high voltages (66,000 volts and above), the air close to the conductor tends to break down under the voltage stress, along the length of the conductor and itself becomes a conductor. This is known as the corona effect. Corona appears in two forms, visible corona as a bluish violet light and audible corona as a hum. Audible corona is common. Visual corona requires higher voltage stress.
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