When we face a choice between adding features and resolving security issues, we need to choose security.

Software suppliers are trying to make their software packages more 'user-friendly'... Their best approach so far has been to take all the old brochures and stamp the words 'user-friendly' on the cover.

I know that historically our foundation has had great relations with all the administrations.[Bill] Clinton administration did a lot of outreach. The greatest rise in U.S. foreign aid was under the [George] Bush administration, that's where we got the AIDS initiative, which is called PEPFAR.

This [philanthropy] work is even more fascinating. It requires us to think harder about how we build partnerships, who we get behind. And yet we get to see progress that in some ways is even more profound than the great advances that digital technology has provided.

Learn from your unhappy customers.

I watched the piles of feces go up the conveyor belt... They made their way through the machine... A few minutes later I took a long taste of the end result: a glass of delicious drinking water.

It's hard to improve public education - that's clear.