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.

While Microsoft does not share all of Oracle's ambitions for Java, we agree that it is a very valuable tool for software developers.

The mainstream is always under attack.

People think about this idea that there's 122 million kids that are alive that would not be if that fatality rate had stayed at the 1990 level, that's 122 million families.

I'm quite worried about the fiscal imbalances that we've got and what that might mean in terms of financial crisis ahead.

You're never going to get the amount of CO2 emitted to go down unless you deal with the one magic metric, which is CO2 per kilowatt-hour.

In fact, batteries haven't improved over the last 100 years as much as they would need to in order to make that happen. So I'm invested in a lot of battery companies - and there's a lot that exists I'm not in. They're all having a tough time achieving it.