Flying cars are not a very efficient way to move things from one point to another.

Vaccines are a miracle; they're fantastic. Anything that makes people hesitate to give their children these vaccines according to the recommended schedule creates risk. Risk for the children who don't get vaccinated and risk for children, some of whom don't have an immune system, so they're benefiting from the fact that the community protection means the disease doesn't get to them.

The future of Windows is to let the computer see, listen and even learn.

The software is where the magic is. If you're going to have all this power be simple enough, appealing enough and cool enough, it's going to be because the software is right.

The best teacher is very interactive.

This is a fantastic time to be entering the business world, because business is going to change more in the next 10 years than it has in the last 50.

Giving money effectively is almost as hard as earning it in the first place.