#timetravel

"0. There are no paradoxes.1. Traveling into the future is easy.2. Traveling into the past is hard — but maybe not impossible.3. Traveling through time is like traveling through space.4. Things that travel together, age together.5. Black holes are not time machines.6. If something happened, it happened.7. There is no meta-time.8. You can’t travel back to before the time machine was built.9. Unless you go to a parallel universe.10. And even then, your old universe is still there."

"Athens failed in Syracuse – and doomed their democracy – not because they fought in the wrong place and at the wrong time, but because they weren’t ruthless enough."

"Everything you wanted to know about the Back To The Future Trilogy but had too little time to ask!"

"Intro of a classic 80's show."

"As a time-traveler acquires multiple recollections of these altered timelines, a fourth-dimensional latticework begins to emerge which can be expressed graphically"

"As a big fan of the movie, I decided to live the cinematic adventure myself by locating each of the sites used in its making."

"We will not learn the lessons necessary for the proper use of what those ships have brought back."

"Let's suppose that eventually some approach results in a practical, even cheap, way to package time machines to make negative time delay elements --which output signals that predict what their inputs will receive some fixed time later."

"MAYBE JOHN TITOR SHOW UP AND PAY GROG BACK 20 DOLLARS HE OWES GROG"

"A title like 'Rotating Universes and Time Traveling' is certainly enough for some people to consider me a mad scientist or an incurable geek."