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.

I've always been interested in science - one of my favourite books is James Watson's 'Molecular Biology of the Gene.'

Research shows that there is only half as much variation in student achievement between schools as there is among classrooms in the same school. If you want your child to get the best education possible, it is actually more important to get him assigned to a great teacher than to a great school.

Lectures should go from being like the family singing around the piano to high-quality concerts.

I don't think there is any philosophy that suggests having polio is a good thing.

“I choose a lazy person to do a hard job. Because a lazy person will find an easy way to do it.”

Well-spent aid money is saving lives for a few thousand dollars per life saved.

It's the poorer people in tropical zones who will get really hit by climate change - as well as some ecosystems, which nobody wants to see disappear.

The advance of technology is based on making it fit in so that you don't really even notice it, so it's part of everyday life.

Eventually, all companies are replaced.

It's a nice reader, but there's nothing on the iPad I look at and say, 'Oh, I wish Microsoft had done it.'

There is a difference between what technology enables and what historical business practices enable.

Of my mental cycles, I devote maybe ten percent to business thinking. Business isn't that complicated. I wouldn't want to put it on my business card.

The ability of a successful company to add functionality to its product has long been upheld.

If you're using first-class land for biofuels, then you're competing with the growing of food. And so you're actually spiking food prices by moving energy production into agriculture.

Maintaining a consistent platform also helps improve product support - a significant problem in the software industry.

Whenever you have multiple devices including multiple PCs that you want to share information with, it's always been a bit complicated.

The thing about HD-DVD that is attractive to Microsoft is that it's very pro-consumer in letting you copy all movies up onto the hard disk.

You may have heard of Black Friday and Cyber Monday. There's another day you might want to know about: Giving Tuesday. The idea is pretty straightforward. On the Tuesday after Thanksgiving, shoppers take a break from their gift-buying and donate what they can to charity.

The protestor I think will speak up for the world's poorest.

Helping convene global stakeholders to establish a set of measurable, actionable and consensus-built goals focused on extreme poverty is invaluable.

I am results-oriented.

I'm not a macroeconomics person.

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.