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28 Nov 2022 04:31

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27 Nov 2022 07:37

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26 Nov 2022 03:00

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24 Nov 2022 05:10

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22 Nov 2022 03:53

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21 Nov 2022 17:01

Which is the most corrosion-
resistant metal?

Iridium is the most corrosion-resistant metal, even at temperatures as high as 2000°C.

It is not attacked by any acid, by aqua regia, by any molten metals, or by silicates at high temperatures​.

Iridium is used when high corrosion resistance and high temperatures are needed, as in spark plugs, crucibles and in unmanned spacecrafts.

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21 Nov 2022 05:41

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20 Nov 2022 02:16

Why do people have different skin colors?

Skin color is due primarily to the presence of a pigment called melanin , which is controlled by at least 6 genes.

Both light and dark complexioned people have melanin.

However, two forms are produced--pheomelanin , which is red to yellow in color, and eumelanin , which is dark brown to black.

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19 Nov 2022 05:16

Why does tea leave brown stains on the cup, whereas coffee does not?

The reason is that tea contains tannin (or tannic acid) which gives tea its colour.

Tannin is used as an agent for many dyes such as in the tanning of leather and in making ink, hence the reason that a stain is left in cups.

One wonders what it does to our insides. Coffee does not contain tannin.

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18 Nov 2022 01:03

Why Bluetooth is called as Bluetooth ?

It's named after a Danish king. Harold "Blåtand" Gormsson, king of Denmark in the 10th century, loved blueberries so much that his teeth were perpetually blue.

"Bluetooth" is simply an anglicized version of his nickname.

Its range is much bigger than it used to be. Bluetooth devices can communicate up to 100 feet.

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17 Nov 2022 00:33

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15 Nov 2022 13:46

When was the first jeans made and who made them?

Jeans are pants made from denim or dungaree cloth.

They were invented by Jacob Davis and Levi Strauss in 1873 and a worn still but in a different context.

Jeans are named after the city of Genoa in Italy, a place where cotton corduroy, called either jean or jeane, was manufactured.

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11 Nov 2022 06:48

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10 Nov 2022 12:28

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08 Nov 2022 12:04

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28 Nov 2022 04:30

Who was the first to land on Australian shores?

Not counting that the indigenous people have inhabited Australia for over 40,000 years, the first to land on Australian shores was not James Cook as most would believe.

In fact, the first European to land was a Dutch explorer by the name of Willem Janszoon.

He is the first recorded person to reach Aussie shores on the western side of the Cape York Peninsula, and he charted around 300km of the coastline in 1606.

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27 Nov 2022 07:36

What is Schengen area?

The Schengen Area is an area comprising 26 European countries that have officially abolished passport and all other types of border control at their mutual borders.

Under the Schengen agreement, transiting from one country to another within the Schengen area is done without border controls.

In fact, the Schengen visa makes it possible to visit all the countries in the Schengen area and to cross internal borders without further formalities.

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26 Nov 2022 02:58

Are Footballs Really Made Of Pigskin?

The first balls were made of natural materials, such as an inflated pig bladder in 1540s, later put inside a leather cover, which has given rise to the American slang-term "pigskin".

Modern balls are designed by teams of engineers to exacting specifications, with rubber or plastic bladders, and often with plastic covers. 

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24 Nov 2022 05:09

Which is the world's first online shopping site ?

The first secure retail transaction over the Web was either by NetMarket or Internet Shopping Network in 1994.

Immediately after, Amazon.com launched its online shopping site in 1995 and eBay was also introduced in 1995.

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22 Nov 2022 03:53

How many bits of information does the brain process?

The brain processes 400 Billion bits of information a second. BUT, we are ONLY aware of 2,000 of those?" -Dr. Joseph Dispenza, D.C. The average "clock speed" of neurons in the brain is a mere 200 firings per second.

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21 Nov 2022 05:43

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21 Nov 2022 05:40

Why is 1921 an important year for mountain climbers?

Because it was in that year that Dalai Lama gave permission for Everest to be climbed for the first time.

This first expedition was mainly to discover if a route to summit could be found from the Tibetan side.

However, though many dreamed of standing on the rooftop of the world, they were all doomed to failure.

In 1922, seven sherpas died in an attempt by the British expedition led by George Mallory to reach the summit. In 1924, a third expedition managed to reach 8572 meter, but two members of the team, Mallory and Irvine, disappeared into the mist and were never seen again!

Mount Everest continued to lure climbers after climbers, but it was only in 1953 that it was finally conquered.

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19 Nov 2022 05:17

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18 Nov 2022 01:08

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17 Nov 2022 15:32

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Today I Learn

16 Nov 2022 16:46

Why is it cooler on top of a mountain?

This is a reasonable doubt indeed, because when we climb up a mountain, though we are going towards the sun, it is still cooler up there on top.

Why is it so?

The air is always warmest near the Earth's surface.

This is because the sun heats the Earth, and the gives off heat that warms the air.

The sun does not warm the atmosphere directly.

For each 300 meters, the temperature drops by about two degree centigrade.

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14 Nov 2022 17:49

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11 Nov 2022 06:46

How many hairs are on the human body?

Blondes have an average of 150,000 hairs, the average redhead has 90,000.

Those with black or brown hair average 110,000 to 100,000 hairs.

There are about 5 million hair follicles on the adult human body and men have a few hundred thousand more than women.

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10 Nov 2022 04:19

What are the major elements human body is made up of ?

Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.

Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium.

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08 Nov 2022 07:20

What is elephant's toothpaste?

Elephant's toothpaste is a foamy substance caused by the rapid decomposition of hydrogen peroxide.

This is often used for classroom demonstrations because it requires only a small number of ingredients and makes a "volcano of foam".

This sometimes is known as the "Marshmallow Experiment", but is unrelated to the psychological Stanford marshmallow experiment.

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