I don't think I would have spent time learning about the immune system if understanding vaccines weren't something I considered very important.

Software is different than other products um, partly because it's, it's not physical and, and partly because of its complexity. You can express in software millions of different cases and making sure that you handle all of them correctly is extremely difficult.

If you're smart, you often want a feedback loop so you know if what you've done is... is right.

The fight against AIDS in China is already well underway. The Chinese government and other funders are providing major support, and they'll continue to bear primary responsibility for delivering prevention and treatment.

My job is about the most fun thing I do, but I have a broad set of interests, going places, reading things, doing things.

Any version of Windows is going to have lots of great new things that people use and things that are tough.

Philanthropy should be voluntary.