".... Once you give a charlatan power over you, you almost never get it back”

Carl Edward Sagan (1934 – 1996) ~ American astronomer, planetary scientist and science communicator. He was one of the most well-known scientist of the 1970's and 1980's . He was controversial in scientific, political, and religious circles for his views on extraterrestrial intelligence, nuclear weapons, and religion. His best known scientific contribution is his research on the possibility of extraterrestrial life. He was an advocate for nuclear disarmament and co-wrote and hosted 'Cosmos: A Personal Voyage.'  He was widely regarded as a freethinker and one of his most famous quotations, in Cosmos, was, "Extraordinary claims require extraordinary evidence.  He died at the age of 62 from complications of Myelodysplastic Syndrome (MDS). More
 
Quote source: From the book "Demon-Haunted World: Science as a Candle in the Dark" by Carl Sagan (1995)