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832. how does a bionic eye works?

a visual prosthesis, often referred to as a bionic eye, is an experimental visual device intended to restore functional vision in those suffering from partial or total blindness.
the bionic vision system consists of a camera, attached to a pair of glasses, which transmits high-frequency radio signals to a microchip implanted in the eye. electrodes on the implanted chip convert these signals into electrical impulses to stimulate cells in the retina that connect to the optic nerve.
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831. what causes red tides?


a red tide is the rapid accumulation of a mass of aquatic algae made up of mobile single-celled micro-organisms known as dinoflagellates – which means ‘whirling whip’ due to the nature of the tail-like projections that propel them through the water. the algae grows, or blooms, more rapidly than usual in order to consume nutrients that have suddenly risen up from the colder depths of the ocean below. the red hue is down to the presence of a certain species of dinoflagellate, or phytoplankton. together with the more abundant diatom algae, dinoflagellates make up the majority of ocean plankton. despite the rather startling appearance of a sea that has been turned red, many algal blooms are actually completely harmless. however, you shouldn’t consume seafood following a red tide as certain phytoplankton can release harmful substances into the water. some dinoflagellates can produce toxins when eaten by other creatures and the harmful substances then concentrate inside the creatures that feed on them, and subsequently any humans who go on to dine on the contaminated seafood. the billions of microscopic dinoflagellates in a red tide can also cause spectacular bioluminescence at night. one species in particular – the lingulodinium polyedrum – can create its own light from within. when the organism is jostled or collides with something in the ocean, a chemical reaction occurs when an enzyme called luciferase and a substrate called luciferin, both contained within the organism, combine. this is the catalyst for a chemical reaction that releases a flash of blue light. when this occurs millions of times simultaneously, the effect is quite remarkable for onlookers.
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830. how do tyre valves work?

a ll tyres use a form of poppet valve, with the most common being the schrader valve. this consists of a hollow cylindrical stem that has threading outside it. running through the centre of the stem is a spring-loaded pin inside a sleeve.a small disc that is located at the bottom of the pin prevents any air from escaping through the sleeve, and when the pin is then pushed down, air is then able to escape through the valve. the strength of the spring determines the pressure that is needed to push it open.
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829. what is the goldilocks zone?

the goldilocks zone is an area ‘just right’ for a life-sustaining planet – the perfect distance from a star with a surface neither too hot nor too cold. it is an intersection of life-sustaining regions within both a solar system and a galaxy. astronomers believe that the goldilocks zone ranges from 0.725 to three astronomical units (each about 150 million kilometres, or the mean distance between the earth and the sun). recently some planetary bodies have come close to fi tting the bill. the april 2007 discovery of gliese 581c in the libra constellation, for example, seemed promising until further research proved it was too hot. however, a nearby planet, gliese 581d, may turn out to be just right. at the same time, the defi nition of the goldilocks zone is expanding as scientists discover life on earth in places previously thought too extreme to sustain it.
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828. what is digital signature?

a digital signature is a mathematical scheme for demonstrating the authenticity of digital messages or documents. a valid digital signature gives a recipient reason to believe that the message was created by a known sender (authentication), that the sender cannot deny having sent the message (non-repudiation), and that the message was not altered in transit (integrity).
digital signatures are a standard element of most cryptographic protocol suites, and are commonly used for software distribution, financial transactions, contract management software, and in other cases where it is important to detect forgery or tampering.
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