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Henley Passport Index 2021

Henley Passport Index is the ranking of all the world’s passports according to the number of destinations their holders can access without a prior visa.

• Ranking is based on exclusive data from the International Air Transport Association (IATA) and ranks 199 passports in total.

• IATA maintains the world’s largest and most accurate database of travel information.

• Japan ranks first on the index with passport holders able to access 191 destinations around the world visa-free.

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SATURN'S TILT

A team of researcher reported that Saturn’s axial tilt is caused by the gravitational pull of Saturn’s moons as they migrate away from their host planet.

Saturn is the sixth planet from the Sun and the second largest planet in our solar system and is made mostly of hydrogen and helium.

Its axis is tilted by 26.73 degrees with respect to its orbit around the Sun, which is similar to Earth's 23.5-degree tilt.

Saturn is the planets with most moons. Titan is the largest moon of Saturn and the second-largest natural satellite in the Solar System.

(Jupiter's moon Ganymede is largest.)

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Democracy Index 2020

The Economist Intelligence Unit (EIU) recently released its report titled “Democracy in sickness and in health” and also published the Democracy Index 2020.

The Democracy Index report 2020 by the covers the 167 countries.

It has classified the economies in categories such as flawed democracies, full democracies, hybrid regimes, and authoritarian regimes.

The report highlights that, 23 countries are full democracies, 52 are flawed democracies, 35 countries are hybrid regimes while 57 countries are authoritarian regimes out of total 167 countries.

In the Democracy Index, Norway has topped. The 2nd 3rd 4th and the 5th ranks have been secured by Iceland, Sweden, New Zealand and Canada respectively in the index.

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Forwarded from Key Finance
Types of Credit

Credit is the arrangement where the borrower receives the money from the lender and in turn, agrees to pay the interest for the period during which money is held with borrower and promise to re-pay after a pre-determined time.

List of Top 8 Types of Credit

1 - Trade Credit

2 - Consumer Credit

3 - Bank Credit

4 - Revolving Credit

5 - Open Credit

6 - Installment Credit

7 - Mutual Credit

8 - Service Credit

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PLANTS GENERATING MAGNETIC FIELD

• A recent study by scientific from Germany found that the Venus flytrap (Dionaea muscipula) plant is capable of generating small magnetic fields.

• These plants send electrical signals to trigger the closure of their traps, to catch an insect, a biomagnetism phenomenon was observed. While leaf stalk, or petiole, is not excitable and is electrically insulated from the trap.

• Magnetic signals in plants are very weak and it was extremely difficult to measure, while using new and advanced atomic magnetometers it is measured at amplitude of up to 0.5 picotesla, which is millions of times weaker than the Earth's magnetic field.

• Scientists hope that this can help in identifying how the plant responds to sudden temperature changes, chemicals, and pest attacks

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Double Taxation Avoidance Agreement (DTAA)

- It is tax treaty between two or more countries to avoid taxing the same income twice is known as DTAA.

- Double taxation is the levy of tax by two or more countries on the same income, asset or financial transaction.


- Under DTAA there are agreed rates of tax and jurisdiction on specified types of income arising in a country.

- When a tax-payer resides in one country and earns income in another country, he is covered under DTAA, if those two countries have DTAA in place. (more related topics)

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What countries border the Black Sea?

The Black Sea is an inland sea located between far-southeastern Europe and the far-western edges of the continent of Asia and the country of Turkey. It's bordered by Turkey, and by the countries of Bulgaria, Romania, Ukraine, Russia and Georgia.

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How is hair produced and how does it grow?

Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft.

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What time period are we in?

We are currently living in the Holocene Epoch of the Quaternary Period. In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age and shorter than a period.

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Why does the ice float on water while it sinks in alcohol?

The specific gravity of ice is less than that of water but the same is more than that of alcohol, hence ice floats on water but sinks in alcohol.

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Why is mercury used in thermometer?

Mercury is the only metal which is in liquid state even at the ordinary room temperature. Also, it uniformly expands when heated and does not stick to the walls of thermometer. Its high boiling point and low freezing point is the main reason for using it in ordinary thermometers.

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Why do the stars twinkle ?

Stars appear to twinkle because its light travels through different layers of space of varying densities. As a result the light from the stars bends and makes them appear to blink on and off.

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How can bats fly in the dark avoiding obstacles?

The ultrasonic waves produced by bats during flying are reflected back when they hit the obstacles. Hence, bats can find their path without any difficulty.

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Since gravity is unlimited, can we use it as an infinite energy source?

No, gravity can not be used as an infinite energy source. In fact, strictly speaking, gravity itself can not be used as an energy source at all. You are confusing forces with energy, which are very different things.

Energy is a property of objects, such as balls, atoms, light beams, or batteries. In contrast, forces describe the interaction between objects. Forces are the way that energy is transferred from one object to another when they interact, but forces are not the energy itself. Gravity is a force, so it just provides one way for objects to exchange and transform energy to different states.

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Can a star turn into a planet?

Yes, a star can turn into a planet, but this transformation only happens for a very particular type of star known as a brown dwarf.

Some scientists do not consider brown dwarfs to be true stars because they do not have enough mass to ignite the nuclear fusion of ordinary hydrogen.

At the same time, some scientists do not consider brown dwarfs to be true planets either because they typically sit at the center of a solar system, just like a star.

Read about - Brown Dwarf

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What keeps space empty?

Space is not empty. A point in outer space is filled with gas, dust, a wind of charged particles from the stars, light from stars, cosmic rays, radiation left over from the Big Bang, gravity, electric and magnetic fields, and neutrinos from nuclear reactions.

As the book "Nothingness: The Science of Empty Space" by Dr. Henning Genz describes, space is also filled with two things we can't directly detect: dark matter and dark energy.

Even if all these things could be removed and blocked out from a certain region of space, there would still be three things we could never remove according to Dr. Genz: (1) vacuum energy, (2) the Higgs field, and (3) spacetime curvature.

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Can wind travel faster than the speed of sound?

Yes, wind can travel faster than the speed of sound. Wind is just the bulk movement of a mass of air through space and is in principle no different from a train speeding along or a comet zipping through space. The only limitation on the bulk motion of objects with mass is the universal speed limit of the speed of light in vacuum.

The speed of sound is not a fundamental speed like the speed of light is. The speed of sound just describes how fast a mechanical wave travels through a material.

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Can gravity form waves?

Yes, gravity can forms waves. Gravitational waves are ripples in spacetime that travel through the universe.

If you think of gravity as a force acting at a distance, it is difficult to visualize how gravitational waves could form. However, if you use the more accurate description of gravity that was developed by Einstein in his general theory of relativity, these concepts become more logical.

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