If a man insisted always on being serious, and never allowed himself a bit of fun and relaxation, he would go mad or become unstable without knowing it.
Bio: Marcos Cesar Pontes is a Brazilian Air Force pilot, engineer, AEB astronaut and author. He became the first South American and the first Lusophone to go into space when he launched into the International Space Station aboard Soyuz TMA-8 on March 30, 2006.