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.

Oh, I think there are a lot of people who would be buying and selling online today that go up there and they get the information, but then when it comes time to type in their credit card they think twice because they're not sure about how that might get out and what that might mean for them.

We're in a period of uncertainty about [Donald Trump] administration policies and the range of what might happen is particularly higher. I don't think that these R&D and innovation budgets will be substantially reduced.

There won't be anything we won't say to people to try and convince them that our way is the way to go.

I believe that the world will be a safer place if there is enough food to go around, that it will be a more stable place if children grow up with opportunities instead of frustrations. Furthermore, I can only assume that if the United States plays a role in helping to create prosperous societies, we will have friends to call on in times of need.

Now, we put out a lot of carbon dioxide every year, over 26 billion tons. For each American, it's about 20 tons. For people in poor countries, it's less than one ton. It's an average of about five tons for everyone on the planet. And, somehow, we have to make changes that will bring that down to zero.

There are several hundred people who stayed in the Ebola-affected countries and continued to do the work, put themselves at great risk because medical workers are the most likely to be infected because they're helping out when the person's health is deteriorating, including quite a bit of bleeding as they're getting very, very sick.