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Who: Italian astronomer
What: He made many astronomical discoveries such as the fact that Jupiter indeed had more than one moon.
When: 1610
How did this affect our world: This affected our world because during that time, the church had everyone convinced that all the planets only had one moon. His discovery would lead to other discoveries in astronomy.

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Who: An English Physician
What: Invented the idea of a "vaccine"
When: Late 1700s
How did this affect our world: This effected our world because it lead to the invention of the first vaccine. This was important because it led to doctors believing that diseases could be prevented. This would lead to doctors advancing their studies and would soon invent vaccines later on such as the flu shot that was one of the most deadly diseases back then.

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Who: A Polish Astronomer
What: Heliocentric Theory
When: Early 1500s
How did this affect our world today:  This affects our world today because it changed our understanding of how our solar system was in order and that the earth is not in the center but the sun and we revolve around the sun. This would also lead to further discoveries in astronomy such as the fact that Jupiter had more then one moon or that the sun was a star.

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Who: Isaac Newton
When: Mid 1600s
What:  The idea that gravity was the force that was in charge of motion of planets and action of bodies on Earth.
How did this affect the world: This affected our world because it led to further understandings of planets and advances in astronomy

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What: A method based on careful observations and willingness to question.
Where:  Originated in Europe
When:  1800
How:   Europeans had begun to question the ideas that they followed that were created by the Greek and Romans
How did this affect the world?  This effected the world because it led to new discoveries through questioning old theories.