In my view, investing in public libraries is an investment in the nation's future.

We all know that there are these exemplars who can take the toughest students, and they'll teach them two-and-a-half years of math in a single year.

Going out in the field, it's always enlightening to see what's working and what's not and to sit down and talk - I was with young girls in south Africa - understanding why our tools for prevention aren't being adopted, and what way may need to invent to help protect them.

With world health, every life you save is a wonderful thing, so it's not this question of whether you solve it or you don't. The chance of completely solving the problems has long odds. But really, the thing is that you get to save the first child, the second child, the third child. You can just feel good about that.

Don't wallow in failure. Instead, learn from it.

Since when has the world of computer software design been about what people want? This is a simple question of evolution. The day is quickly coming when every knee will bow down to a silicon fist, and you will all beg your binary gods for mercy.

By helping us to be more productive, technology lets us to spend less time focusing on survival, and more on solving other challenges.