You may have heard of Black Friday and Cyber Monday. There's another day you might want to know about: Giving Tuesday. The idea is pretty straightforward. On the Tuesday after Thanksgiving, shoppers take a break from their gift-buying and donate what they can to charity.

I like the idea of putting your Christmas wish list up and letting people share it.

I don't think there's anything unique about human intellience. All the nuerons in the brain that make up perceptions and emotions operate in a binary fashion.

The vision is that people should have the ultimate in convenience. Being able to get the things they care about on the appropriate device.

I am surprised that in various countries, whether it's the U.K. or the U.S., you see isolationist tendencies that would tend to work against the co-operation, whether it's climate change, immigration, innovation, helping the very poorest. Those are things where you want to think across country boundaries and see a win-win-type solution.

Bioterrorism is like earthquakes, you should think in order of magnitudes. If you can kill 10 people that's a one, 100 people that's a two... Bioterrorism is the thing that can give you not just sixes, but sevens, eights and nines.

In the U.S., we believe the best way to improve lives is to improve public education.