An invention is a new configuration, composition of matter, device, or process. Some inventions are based on pre-existing models or ideas and others are radical breakthroughs. Inventions can extend the boundaries of human knowledge or experience.
A. In 1816, the French physician Rene Theoplhie Laennec (1781-1826) introduced a perforated wooden cylinder which concentrated the sounds of air flowing in and out of the lungs, and described the sound which it revealed. The modern form of stethoscope, with flexible tubes connecting the earpieces to a circular piece placed against the chest, was developed later in the nineteenth century.
Q. How did arithmetical numbers come into existence? Where was ‘zero’ invented?
A. The arithmetical numbers, which are universal today, were first invented system in India. This is known as Hindu numeral system. It simplified calculations by marking the values of a number depend on its position as well as the number itself. In the number 444, the single figure 4 represents 400, 40 and 4, and the whole number is the sum of these values. In contrast, the Romans used symbols whose values were the same irrespective of their positions.
Hindu numeral system included a zero. So, zero was first invented in India. Zero revolutionised arithmetical calculations and the numeral system. It was adopted by the Arabs and then reached Europe as early as in 10th century.
Q. Who invented insulin?
A. Insulin is a very useful drug for diabetes and was discovered by the Canadian physician and Nobel price winner , Dr.Federik Grant Banting in 1921.
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