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In 1982, the first permanent artificial heart was transplanted into a 61-year-old patient named Barney Clark by surgeons at the University of Utah. The first artificial heart to be successfully implanted in a human was the Jarvik-7, designed by a team including Willem Johan Kolff and Robert Jarvik.

Rubella, also known as German measles or three-day measles, is an infection caused by the rubella virus. This disease is often mild with half of people not realizing that they are infected. A rash may start around two weeks after exposure and last for three days.

Rolled gold is made by fusing a base metal, usually silver, brass or copper. The metals are then bonded together using heat and rolled into flat sheets for use in jewelry.

Aluminum and zinc react with acids to form hydrogen gas.

Myopia is also known as short sight which is corrected using a concave lens. Long sightedness( Also called as hypermetropia) is corrected using a convex lens.

The generally accepted standard range of audible frequencies for humans is 20 to 20,000 Hz.

The other units of temperature are Celsius and Faharenheit. Unit of Work (Energy )is Joule. Unit of Power is Watt.

The concept of isotope was introduced by F. Soddy in explaining aspects of radioactivity; the first stable isotope (of neon) was discovered by J. J. Thomson.

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