Antonie van Leeuwen-hoek called "Father of Microbiology"

Antonie van Leeuwen-hoek was a 17th century Dutch scientist. He is best known for discovering protozoa, and creating more than 500 simple microscopes. Van Leeuwenhoek was the first scientist to closely observe cells under a microscope. One of his most groundbreaking discover100 Great Sies was also one of his first. His observations, in 1674, of scummy pond water, led to the first visual descriptions and illustrations of such common organisms as the algae spirogyra. This contributed towards the foundation of several branches of biology. He made one of the first recorded observations of bacteria when he studied the plaque from his teeth. He noticed what he called animalcules' in the saliva sample. These animalcules were actually bacteria. He gave cells their name because he thought they resembled the shape of a monk's quarters. Although Van Leeuwen-hoek never received any formal scientific training, he is considered to be the father of microbiology for his contributions to that field of science.

Why is Pythagoras considered one of the greatest scientists of all time?

Pythagoras was an Ancient Greek mathematician and philosopher who lived more than 500 years before Christ. He spent most of his life in the Greek colonies in Sicily and southern Italy. He was also a philosopher, and founder of the religious movement called Pythagoreanism. Pythagoras had a group of disciples who followed him around, and taught other people what he had taught them. He made crucial contributions to modern philosophy, as well as mathematics, science, and religious mysticism. It is also believed that he had a significant influence on medicine, music, astronomy, and divination. Pythagoras is best known for the mathematical theory named after him. He is without doubt, one of the greatest scientists not only of the ancient world, but of all time.

Why is Alhazen known as the pioneer of modern optics?

Born in the tenth century AD, Alhazen was an Arab who was known as the first true scientist. He developed the scientific method of experimentation, and was the first person to formulate hypothesis and conduct verifiable experiments. A scientist, philosopher, astronomer, and mathematician, Alhazen wrote over a hundred books, more than half of which have been preserved. One of his most influential writings was in the field of optics. In this book Alhazen gave experimental proof of the nature of light, the structure of the eye and the basic principles of reflection via mirror. He stated that contrary to popular belief, the eye does not send out rays to the object it sees. Rather it is the light reflected via the object that the eye beholds. This was a completely new and revolutionary concept. The book comprises sevenvoles, and was translated into Latin.

What are the major contributions made by Archimedes?

Archimedes is best remembered as an ancient Greek scientist who made legendary contributions to mathematics, physics, engineering, and astronomy. Archimedes, who lived about 300 years before Christ, is also remembered for his discovery of the relation between the surface and volume of a sphere, and its circumscribing cylinder. He played a major role in developing calculus and analysis. This scientist explained how levers worked, andbuiltwar machines. But, Archimedes is most famous for the Archimedes Principle which explains how to measure the volume of an irregular object. Archimedes discovered his principle quite by accident. He noticed that the water level of the bathtub rose when he got in, and he realised that you could measure volume by putting it on water, and measuring how much the water level rose. Supposedly, the scientist got so excited by this discovery that he ran through the streets naked, yelling Eureka!' which is Greek for 'I figured it out!

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