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                    What is deepest part of ocean ?

The Challenger Deep in the Mariana Trench is the deepest known point in Earth's oceans. 

In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 10,994 meters (36,070 feet) below sea level with an estimated vertical accuracy of ± 40 meters.

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                    What is melting point of human bones ?

The exact composition of these compounds varies upon the type of bones being used, but generally the formula for bone ash is: Ca5(OH)(PO4)3. 

Bone ash usually has a density around 3.10 g/mL and a melting point of 
1670°C (3038 °F). 

Most bones retain their cellular structure through calcination.

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                    What is motion sickness ?

Motion sickness is a very common disturbance of the inner ear that is caused by repeated motion such as from the swell of the sea, the movement of a car, the motion of a plane in turbulent air, etc.  

Some people experience nausea and even vomiting when riding in an airplane, automobile, or amusement park ride.

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                    What is Darknet?

Contrary to deep web, Darknet is better known to the people. 

It is an encrypted network built on top of the existing internet, and specific software or tools are required to access the darknet. 

It is possible, conventional protocols used on the internet might not work on the darknet.

Darknet provides anonymity to the users. One such darknet is Tor or The Onion Router.

You require the Tor browser to enter into the Tor's network.

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                    What Happens to Your Body When You're Kissing ?

The physical thrill may prompt your brain to cue up dopamine, a neurotransmitter associated with pleasure. 

At the same time, other parts of your brain are shutting down negative emotions.

Your lip locking may also have prompted your pituitary gland (and his) to release oxytocin, the "bonding hormone." 

You two might already be forming an emotional attachment.

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                    Why do house lizards hate egg shells?

If you place cracked eggshells around the house, in corners, and in windows, the occurrence of lizards should decrease noticeably. 

Lizards associate the broken shells with larger predators such as birds and larger reptiles. 

Peacock feathers. This works on the same principal as the egg shell idea.

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                    Why does the liquid part of the egg become solid when we boil it? 

But when an egg is boiled or heated, the heat causes to make a longer and stronger chain of protein molecules and becomes unfolded. 

Once these proteins become unfolded the protein molecules get trapped among each other and become hard. 

This is because of heat an egg becomes solid after boiling.

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                    How old is the moon?

The scientific consensus is that the Earth's moon formed four and half billion years ago. 

About 100 million years after the formation of the solar system, another small planet is likely to have collided with the Earth, resulting in the formation of the Moon.

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                    How Long Does it Take Sunlight to Reach the Earth? 

In space, light travels at 300,000 kilometres (186,000 miles) per second.

Even at this breakneck speed, covering the 150 million odd kilometres (93 million miles) between us and the Sun takes a considerable time. 

And eight minutes is still very little compared to the five and a half hours it takes for the Sun's light to reach Pluto.

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                    What planet rotate clockwise in our solar system ?

Venus and possibly Uranus are the exceptions to the counterclockwise rotations of the planets. 

Venus travels around the sun once every 225 Earth days but it rotates clockwise once every 243 days. 

This pecular combination gives it a day with respect to the sun of 117 Earth days.

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                    Can you walk if there is no friction?

You could not walk without 
the friction between your shoes and the ground. 

As you try to step forward, you push your foot backward. Friction holds your shoe to the ground, allowing you to walk. 

Consider how difficult it is to walk on slippery ice, where there is little friction. Walking without friction is like walking on a treadmill, you won't be able to go anywhere, but just slip on the same exact position. 

Matter of fact, that you won't be able to walk on even a treadmill. But only humans won't be affected, even the animals would be affected and for some like snakes, moving is impossible.

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                    Are Nonstick Pans Safe? 

Primarily, this means not overheating the pan. Overheating nonstick panscauses their coating to break down, which can result in the release of surface particles and/or toxic gases.

A specific concern is PFOAs (perfluorooctanoic acids), one of the chemicals used to make somenonstick pan coatings, includingTeflon.

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                    Why do bodyguards wear black goggles ?

A bodyguard can watch somebody cloesly without alerting that person. 

Knowing that you are being watched may make anninnocent person act suspicious. It presents a dehumanized appearance, implying fewer weaknesses. 

They protect the eyes from dust and glare, allowing them better vision.

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                    What Are Taste Buds? 

Those tiny hairs send messages to the brain about how something tastes, so you know if it's sweet, sour, bitter, or salty. 

The average person has about 10,000 taste buds and they're replaced every 2 weeks or so. 

But as a person ages, some of those taste cells don't get replaced.

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                    What Do Kangaroos Keep In Their Pockets? 

Kangaroos and other marsupials havea special pouch  called a marsupium for carrying their babies, because their young are particularly small when they're born. 

A baby kangaroo called a joey is about the size of a lima bean when it's born.

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                    What is an image replay attack ?

An image replay attack is the use of a picture to fool an authentication method.

Image replay attacks are most commonly used by an attacker trying to gain entry to a system protected by less-than-secure biometric authentication technology implementations. 

The method has been used successfully against low-end fingerscanners, iris scanners and facial recognition systems.

In the simplest cases, image replay attacks involve a printed image of the subject used for authentication. 

An attacker might, for example, present a picture of an authorized user to a facial recognition system. 

Extra measures can be implemented in facial recognition and iris scans to foil printed or static images, however; such measures include requiring the user to wink, blink or speak.

More sophisticated image replay attack methods may involve recorded video and audio playback to defeat these measures. 

Methods of defeating these attacks exist as well, however. Video and audio are typically out of sync to a detectable degree when played back from a file. Security algorithms have been created to detect the discrepancy and prevent these attacks.

Making biometric authentication methods secure from image replay attacks can't rely on the methods used to detect data replay attacks. (The opposite is also true.) 

When security is important, it is advisable for administrators to be aware of both attack methods and counter measures.

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                    How do Bullets work? 

When you pull the trigger of a gun, a spring mechanism hammers a metal firing pin into the back end of the bullet, igniting the small explosive charge in the primer. 

The primer then ignites the propellant, the main explosive that occupies about two thirds of a typical bullet's volume.

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                    Why Are Moths Drawn to Artificial Lights? 

In a behavior called transverse orientation, some insects navigate by flying at a constant angle relative to a distant light source, such as the moon. 

But around man-made lights, such as a campfire or your porch light, the angle to the light source changes as a moth flies by. 

This confuses it.

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