Asymmetry is the absence of, or a violation of, symmetry (the property of an object being invariant to a transformation, such as reflection).ymmetry is one of the most powerful tools in particle physics, because it has become evident that practically all laws of nature originate in symmetries. Violations of symmetry therefore present theoretical and experimental puzzles that lead to a deeper understanding of nature.
John Fitzgerald Jack Kennedy (May 29, 1917 â November 22, 1963), commonly referred to by his initials JFK, was an American politician who served as the 35th President of the United States from January 1961 until his assassination in November 1963.
John F. Kennedy was the 35th president of the United States. He served one incomplete term in office, which ended on the day of his assassination in 1963. Kennedy, who was often referred to as JFK, became a symbol of a more innocent era when he was killed, even though his presidency was fraught with tensions. Kennedy is known for being the youngest president ever elected, although Theodore Roosevelt was the youngest president in office. He was also the only president to win a Pulitzer Prize and to have a Catholic background.