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A Hacker is a person who finds and exploits the weakness in computer systems and/or networks to gain access. Hackers are usually skilled computer programmers with knowledge of computer security.
Ethical Hacker (White hat): A hacker who gains access to systems with a view to fix the identified weaknesses. They may also perform penetration testing and vulnerability assessments.
Cracker (Black hat): A hacker who gains unauthorized access to computer systems for personal gain. The intent is usually to steal corporate data, violate privacy rights, transfer funds from bank accounts etc.
Grey hat: A hacker who is in between ethical and black hat hackers. He/she breaks into computer systems without authority with a view to identify weaknesses and reveal them to the system owner.
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Lungs are the chief centres of the respiration in humans and other vertebrates. They are located in the thoracic cavity of the chest near the backbone and on either side of the heart. They are the pair of large, spongy organs, mainly involved in the exchange of gases between the blood and the air. Compared to the left lung, the right lung is quite bigger and heavier.
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In ancient times, people actually built sand filtration columns. As the water slowly trickled through the column, it cleaned the water. When using soil or sand as a filter, particles that might be bad for you get stuck in the little gaps, or pores. This small stuff gets trapped as the water continues to flow down.
<div data-md="61"> <div aria-level="3" data-attrid="wa:/description" data-hveid="CA0QJw" role="heading">Around 500 B.C., the first known domestic filter appeared when the Greek scientist Hippocrates invented the so-called Hippocratic sleeve, which consisted of a simple cloth back filter. During the third and fourth Century, the Egyptians purified their drinking water using a variety of methods.</div> </div> <div class="g"> <div class="rc" data-hveid="CA0QKA" data-ved="2ahUKEwjdl4eBioXsAhWPxDgGHS3zAXcQFSgCMAt6BAgNECg"> <div class="r"> </div> </div> </div>Posted by Dhanashree Jadhavrao 5 years, 3 months ago
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Troposphere: It is the lowest layer of the Earth's surface that extends to a height of 8 km at the poles and 18 km at the Equator. This layer is characterised with weather phenomenon like cloud formation, thunderstorms, rainfall and snowfall. Here, temperature decreases with the increase in height.
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