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.
He was the first president to be born in the 20th century. He was elected the thirty-fifth president in 1960 and took office on January 20, 1961. Following are ten key facts that are important to understand when studying the life and presidency of John F. Kennedy. John F. Kennedy's father, Joseph Kennedy, was extremely wealthy and powerful. Franklin D. Roosevelt named him the head of the US Securities and Exchange Commission (SEC). He was made the ambassador to Great Britain in 1938.