When you're an investor, you can look at the quantitative and qualitative elements of an investment, but there's a third aspect: What you feel in your gut.

When you're an investor, you can look at the quantitative and qualitative elements of an investment, but there's a third aspect: What you feel in your gut.

Nobody forces you to work at Wal-Mart. Start your own business! Sell something to Wal-Mart!

Imagine how foolish you'd look if, like one clever salesman who once pitched to me, you tried to license your product to a big industry player without knowing they just launched a competing product. With the right background research, he could have avoided that and other landmines - and so can you.

When you're travelling, your day is jam-packed. I just don't have time to whip out a PC all the time. But I can whip out a BlackBerry and tweet. I keep a constant diary of where I'm at and why I'm there.

I think a book is your calling card, your business card.