I was the Chair of the first department of medical physics in a medical school in the U.S.
At two-tenths the speed of light, dust and atoms might not do significant damage even in a voyage of 40 years, but the faster you go, the worse it is--space begins to become abrasive. When you begin to approach the speed of light, hydrogen atoms become cosmic-ray particles, and they will fry the crew. ...So 60,000 kilometers per second may be the practical speed limit for space travel.
One of my producers said this business is like a hamster on that little wheel thing that goes around and around. You may have a great day and get great ratings, but then you've got another show to do - whatever moment of success or happiness you have you've got to keep grinding it out for the next day.
I once felt all that kind of anger, which a man ought to feel, against the mean principles that are held by the Tories: a noted one, who kept a tavern at Amboy, was standing at his door, with as pretty a child in his hand, about eight or nine years old, as I ever saw, and after speaking his mind as freely as he thought was prudent, finished with this unfatherly expression, Well! give me peace in my day. Not a man lives on the continent but fully believes that a separation must some time or other finally take place, and a generous parent should have said, If there must be trouble, let it be in my day, that my child may have peace; and this single reflection, well applied, is sufficient to awaken every man to duty.
Thomas Paine, The American Crisi