Sex: the thing that takes up the least amount of time and causes the most amount of trouble.
I'm the type of guy that feels pressure when I have to order dinner. I'm just that type of guy but that's my fuel. I work well with pressure.
For example, a breakthrough in better batteries could supplant hydrogen. Better solar cells could replace or win out in this race to the fuel of the future. Those, I see, as the three big competitors: hydrogen, solar cells and then better batteries.