Although I cannot move, and I have to speak through a computer, in my mind, I am free.

The downside of my celebrity is that I cannot go anywhere in the world without being recognized. It is not enough for me to wear dark sunglasses and a wig. The wheelchair gives me away.

Sometimes I wonder if I'm as famous for my wheelchair and disabilities as I am for my discoveries.

If time travel is possible, where are the tourists from the future?

Its a crazy world out there. Be curious.

The human failing I would most like to correct is aggression. It may have had survival advantage in caveman days, to get more food, territory or a partner with whom to reproduce, but now it threatens to destroy us all.

While there's life, there is hope.