Everyone knows about Black Friday and Cyber Monday. Now help me spread the word about Giving Tuesday!

Who can afford to do professional work for nothing? What hobbyist can put three man-years into programming, finding all bugs, documenting his product, and distributing it for free?

On the supply side, for innovation, you'd say, go look at those R&D budgets, and they haven't moved in the last 20 years. In the case of the US - which is the majority of R&D funding across every category you can name: health, energy, whatever - it's been about $5 billion a year from the Department of Energy.

Improving the health & productivity of the poorest is one of the best investments you can make in the future of the world

The only thing I understand deeply, because in my teens I was thinking about it, and every year of my life, is software. So I'll never be hands-on on anything except software.

It's easier to add things on to a PC than it's ever been before. It's one click, and boom, it comes down.

As we look ahead into the next century, leaders will be those who empower others.