One funny thing is, though, I wear my watch on my right hand and I'm actually right-handed. People always wonder why - I don't know myself, I've just always done it that way and I like it the way a good watch fits on my right wrist.
When you write down your ideas you automatically focus your full attention on them. Few if any of us can write one thought and think another at the same time. Thus a pencil and paper make excellent concentration tools.

