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The Prism Experiment!
Isaac Newton had a rival named Halley. They both fought about who made calculus first. (Isaac Newton won the fight)
Isaac Newton was the only child of his father (also named Isaac Newton), who died 3 months before his son's birth. His mother Hannah remarried when Isaac was only three years old. She had three more children Benjamin, Mary and Hannah, his half brother and sisters to whom Sir Isaac Newton subsequently left most of his property.
His father was also called Isaac, and his mother was Hannah Ayscough before her marriage. Isaac senior died before his son was born, and Hannah remarried, to a vicar called Barnabas Smith, with whom she had three more children, Benjamin, Mary and Hannah. Isaac Newton did not marry.
He published the laws of motion on July 5th 1687 in Philosophiae Naturalis Principia Mathematica.