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Famous Inventions theories and discoveries in the world  1 Galileo was the first in the world who discover the rotation of the earth 2. Kohler and Milstein discovered monoclonal antibodies. 3. Mathew Barry invented photography 4. Albert Sabin was first medicine expert who invented the Polio vaccine (oral) 5. Dmitry Ivanovich Mendeleyev was a Russian, and he was the first man who published his first version of the periodic table in 1869. 6. James Clark was the first one world who invent the x-ray machine 7. Arthur Campton was the first one who discovered x-rays and Cosmic rays. 8. Chadwick discovered Neutron 9. Galileo invented the telescope 10. Alexander Fleming discovered penicillin 11. Noble gases discovered by Cavendish 12. Gun powder was first invented in China for the first time in the world  13. for the first time in the world, the Velocity of light was measured by Michelson 14. Archimedes was the first man who gave laws about Floatation of Bodies  15. Balloon fly u...

  Preposition types What is Preposition, and types of Preposition? A Preposition Is the 6th part of speech which is defined as a word that comes before a noun or pronoun to show in what relation the person or thing denoted by it stands in this regard to something else Any noun or pronoun that is used with a preposition is called its object  sometimes prepositions may have two or more objects That road runs to Lahore and Islamabad Kinds of Preposition Simple Preposition  (preposition types)  : This type of Preposition is often placed after a verb or adjective and tell us something about the noun or pronoun. For example At  By for  From In  Of  Off With Up  To  Till Out  Through On Usage of simple Preposition He is fond of sweets  He is at home He is looking at me  Ahmed is very good at math learn English grammar Compound Preposition  (preposition types)  : This type of Preposition is generally formed by placing be...