Whether it's Google or Apple or free software, we've got some fantastic competitors and it keeps us on our toes.

Haiti should remind us all that there is an immediate need to invest in and promote long-term development projects that are sustainable, scalable, and proven to work.

Like any well designed software product, Windows is designed, developed and tested as an integrated whole.

Nuclear energy, in terms of an overall safety record, is better than other energy.

Technology must be implemented as part of a thoughtful, holistic approach to education transformation that includes teacher training, relevant curricula, parental involvement, and programs for children that fill unmet needs for basics like nutrition and health care.

Until recently, over 98 percent of teachers just got one word of feedback: Satisfactory. If all my bridge coach ever told me was that I was 'satisfactory,' I would have no hope of ever getting better.

When I say "miracle" I mean a kind of thing like a computer on a chip, or the internet, or the cellphone, that are really quite miraculous. Most people would not have predicted them, and their effect has been very, very dramatic.