Today I Learn

10 May 2023 02:19

​​What is Footing in a Building Construction?

Footings are an important part of foundation construction. They are typically made of concrete with rebar reinforcement that has been poured into an excavated trench. The purpose of footings is to support the foundation and prevent settling. Footings are especially important in areas with troublesome soils.

The construction of footings is best left to the pros that can assess the soil conditions and decide on the proper depth and width for the footings as well as the proper placement. The dimensions of footings also depend on the size and type of structure that will be built. Placement of footings is crucial to provide the proper support for the foundation and ultimately the structure.

Concrete footings may also be needed for projects such as a deck, pergola, retaining wall or other types of construction.

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06 May 2023 06:18

​​What are Anti-Collision Lights?

Anti-collision lights, also known as Beacon lights or Strobe lights are a set of lights required on every aircraft to improve visibility to others, as well as collision avoidance measures by warning other pilots. Historically they have used incandescent bulbs, but recently Light-emitting diodes have been used.

Beacon lights are flashing red lights fitted on the top and bottom fuselage of an aircraft usually on larger passenger aircraft. Their purpose is to alert ground crew and other aircraft that an engine is starting up, running or shutting down, or that the aircraft is about to start moving. Some spin to produce the flashing effect, increasing the chance they will be noticed. Beacon lights are bright enough to be seen from the ground, and can be used to identify aircraft from the ground in dark or overcast conditions where the plane itself isn't completely visible.

Strobe lights are flashing white lights on the furthest left, right and, on larger aircraft and some smaller ones, back points of an aircraft. They are the brightest lights on the aircraft, and are used to signal that an aircraft is entering or approaching an active runway, or for visibility in dark, clear sky. They are sometimes turned off in cloud or fog, as they can further obscure the pilot's sight outside of the aircraft by reflecting off water particles.

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26 April 2023 03:14

Which Animal that never drinks water in its entire life ?

The tiny kangaroo rat found in the south western deserts of the united states does not drink water in its entire life. Kangaroo rats are an important part of desert life. They are often eaten by other animal for the water in their bodies.

The rats can run very fast, covering 6 meters in one second, Because of their long powerful legs and the strong tail which resemble those of the kangaroo they are called the kangaroo rats.

They grow to about 38 cm long, including a tail of 20cm.

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25 April 2023 15:45

New Words Daily with its Meaning.

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23 April 2023 09:23

How many planets do not have natural satellites ?

Two planets, Venus and Mercury, are the only planets in the solar system that do not have any natural satellites or moons.

Mercury, Venus, Mars and Earth are inner planets. 

The outer planets are Jupiter, Uranus, Saturn and Neptune.

Earth has one large natural satellite, known as the Moon; and Mars has two tiny natural satellites, Phobos and Deimos.

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11 April 2023 02:04

How does the blood type work?

The test to determine your blood group is called ABO typing. Your blood sample is mixed with antibodies against type A and B blood. Then, the sample is checked to see whether or not the blood cells stick together. If blood cells stick together, it means the blood reacted with one of the antibodies.

Blood typing procedure:

•Mix! First mix the patient's blood with three different reagents including either of the three different antibodies, A, B or Rh antibodies!

•Look for agglutination!

•Then you take a look at what has happened.

•Figure out the ABO blood group!

•Figure out the Rh blood group!

•Figure out the blood type!

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05 April 2023 17:38

New Words Daily with its Meaning.

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04 April 2023 15:12

New Words Daily with its Meaning.

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02 April 2023 15:30

New Words Daily with its Meaning.

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31 March 2023 04:52

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30 March 2023 10:19

Do you enjoy reading this channel?
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28 March 2023 14:42

New Words Daily with its Meaning.

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24 March 2023 13:26

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23 March 2023 14:16

New Words Daily with its Meaning.

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16 March 2023 13:47

New Words Daily with its Meaning.

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08 May 2023 07:31

​​Why Does Body Temperature Rise During Fever?

We have three groups of neurons in the hypothalamus, at the base of the brain, that are responsible for regulating body temperature: a hypothalamic thermostat that monitors skin temperature (via incoming signals from nerve fibers) and blood temperature; a heat-promoting center that raises body temperature; and a heat-losing center that lowers body temperature.

An infection stimulates the immune system to produce chemicals called endogenous pyrogens. These and prostaglandin E2 raise the set point of the hypothalamic thermostat (like turning up the thermostat in your house). The heat-promoting center constricts blood vessels near the skin surface so more heat is retained in the body, and if that’s not enough, it stimulates shivering to generate more heat, until the body temperature reaches the new set point.

The elevated temperature makes it harder for bacteria and viruses to multiply, so the immune system can overwhelm these pathogens faster than they reproduce and rid the body of the infection. Fever is thus a healthy mechanism that enables the body to recover from infection more quickly.

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29 April 2023 04:30

Why are the Pamirs called the Roof of the World ?

It is called the roof of the world because they are at high altitude.

The Pamir Mountains are a mountain range in Central Asia formed by the junction of the Himalayas with Tian Shan, Karakoram, Kunlun, and Hindu Kush ranges.

Pamirs Mountainous region in central Asia, lying mostly in Tajikistan and partly in Pakistan, Afghanistan, and China. The region forms a geological structural knot from which the Tian Shan, Karakoram, Kunlun, and Hindu Kush mountain ranges radiate.

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25 April 2023 16:40

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24 April 2023 14:15

Why is yawning infectious?

Yawning is a result of increased levels of carbon dioxide in the lungs – often occurring as a result of a lower breathing rate when the body relaxes.

If a group are all relaxing together, it is probable they’ll all reach the same elevated level of CO2 at approximately the same time.

Hence they may feel the need to yawn at the same time.

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11 April 2023 19:15

New Words Daily with its Meaning.

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08 April 2023 14:33

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05 April 2023 03:45

Why pirates cover their one eye ?

Some assume pirates wore eye patches to cover a missing eye or an eye that was wounded in battle, but in fact, an eye patch was more likely to be used to condition the eye so the pirate could fight in the dark.
It takes an average human eye about 25 minutes to fully adapt from bright sunlight to seeing in complete darkness—if a pirate was fighting on deck in the light, then had to go under the deck to fight downstairs where it is usually pretty dark, that would be a long time to go without being able to see.  The eye patch could be used to prepare one eye to see in the dark, so when they would go below deck they could swap over the eye patch from one eye to the other and see with the eye that has already adjusted to low light conditions. This would allow them to instantly in the dark.

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04 April 2023 04:53

Can Rainbows be full circles?

Yes! Rainbows can be full circles.

However, the observer normally sees only an arc formed by illuminated droplets above the ground, and centred on a line from the sun to the observer's eye.

In a primary rainbow, the arc shows red on the outer part and violet on the inner side.

This rainbow is caused by light being refracted when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.

In a double rainbow, a second arc is seen outside the primary arc, and has the order of its colours reversed, with red on the inner side of the arc.

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02 April 2023 07:27

How are bubbles formed in boiling water?

At room temperature, there is always some air dissolved in water.

The colder the water, the more air is dissolved. Air becomes less soluble in water as the temperature rises.

When the water boils the air is released in the form of bubbles. Two thousand years ago, an attempt was made to use the power of steam with Heron's ball, but the great breakthrough came only with the steam engines.

The steam engine improved by James Watt is the most well-known.

A little later the steam engines were used to drive locomotives and paddle steamers – the modern steam turbines followed later.

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30 March 2023 16:13

New Words Daily with its Meaning.

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29 March 2023 15:00

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25 March 2023 06:09

Which is the shortest war ever fought?

The war between Zanzibar (presently part of Tanzania) and the imperial British is the shortest war ever fought.

It lasted for about 40 minutes. The immediate cause was the ascension of new sultan who was not ready to cooperate with the imperial power, thus British gave him an ultimatum to surrender which he rejected.

In the ensuing battle their defense failed pathetically before the mighty royal navy.

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24 March 2023 13:25

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18 March 2023 01:52

Who invented the lock and key?

Linus Yale, Jr.
In 1861, Linus Yale, Jr.  was inspired by the original 1840s pin-tumbler lock designed by his father, thus inventing and patenting a smaller flat key with serrated edges as well as pins of varying lengths within the lock itself, the same design of the pin-tumbler lock which still remains in use today.

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16 March 2023 05:47

Which planet is the least dense?

If you're looking for a place a bit more airy, you could always visit Saturn.

The gas giant is the least dense planet in the solar system with an average density of a scant 0.70 grams per cubic centimeter.

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