Time travel may be possible, but it is not practical.

Keeping an active mind has been vital to my survival, as has been maintaining a sense of humor.

I believe that the long-term future of the human race must be space and that it represents an important life insurance for our future survival, as it could prevent the disappearance of humanity by colonizing other planets.

Latest survey shows that 3 out of 4 people make up 75% of the world's population.

Hang in there, retirement is only thirty years away!

Perhaps we could write code to optimize code, then run that code through the code optimizer?

It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years.