Sir Isaac Newton discovered gravity in 1650, when an apple fell on his head.
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Sir Isaac newton is said to have discovered the concept of gravity in 1665 or 1666, when he observed an apple falling from a tree. This observation eventually led to his development of the law of universal gravitation.
Sir Isaac Newton was born on January 04/1643 using the Gregorian year calendar date, or December 25/1642 using the O.S. Julian calendar.
Sir Isaac Newton is not known to have had a nervous breakdown. However, he did suffer from periods of intense stress and anxiety, especially towards the end of his life.
It is not possible to get to know him in any other way since (in 2016) he has been dead for 289 years.
First of all, Newton never stated the apple fell on his head, he only said that he began to think vigorously upon universal gravity while watching an apple fall from a tree. Newton also never stated even the year he had this experience (he recounted it to friends decades after the fact), but his notebooks show he began working on gravity in the late 1660s.
Isaac Newton's inventions and contributions to science were important because they laid the foundation for classical mechanics and the laws of motion, which revolutionized our understanding of how the physical world operates. His work in mathematics and optics also had significant impacts on scientific and technological advancements in various fields.