One, remember to look up at the stars and not down at your feet. Two, never give up work. Work gives you meaning and purpose and life is empty without it. Three, if you are lucky enough to find love, remember it is there and don't throw it away.
Happy 73rd birthday, Stephen Hawking! When the astrophysicist wrote A Brief History of Time, his publisher said that every mathematical equation in the book would cause readership to go down by 50 percent. Hawking heeded their advice and included just one: E=mc2. The book has sold nearly 10 million copies.