The function of kidneys to remove toxins or waste products from your blood.

Kidneys keep the right amount of water in the body. They balance vitamins and minerals including sodium potassium and phosphorus. They make sure the acid level in the blood is correct. Your kidneys also help control your blood pressure. 

This relationship is called Boyle's Law and makes up part of the ideal gas law. When the volume of a gas shrinks, the gas molecules have less space to move around and so they hit their container.

The Sun is the star at the centre of the Solar System.

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Very high frequency is ITU designation for the range of radio frequency electromagnetic waves from 30 to 300 megahertz, with corresponding wavelengths of ten to one meters.

 Short-sight defect could be corrected by using concave lens while long-sight defect could be corrected by using convex lens.

 A biosensor is a sensor exploiting a bio-molecule and is used to measure the presence of a certain substance in a liquid.

For example, the medical world uses biosensors to detect a virus in the blood or to measure glucose levels in blood.

These are mainly point-of-care applications, where direct results are important.

Wilhelm Conrad Rontgen produced and detected electromagnetic radiation in a wavelength range known as X-rays or on 8 November 1895.

He got the Nobel Prize in Physics in 1901.

He belonged to Germany.

 The speed of light is much faster than the speed of sound in air.

Light travels 186 thousand miles in 1 second, while sound takes almost 5 seconds to travel 1 mile.

Salt is a mineral composed primarily of sodium chloride.