I work late at night. I'm awake and nobody bothers me. It's quiet and things come and talk to me in the silence.
I was recently looking at what they can actually do to reduce consumption of petrol. It would be quite possible to build automobiles out of carbon fibre that would be just as strong, weigh 10 times less and consume 10 times less petrol.
I still dance, probably three times a week, unless I'm working on a crazy job, and then I just don't have any free time at all.

