One of the things you learn as president is, as powerful as this office is, you have limited bandwidth. And the time goes by really quickly and you're constantly making choices, and there are pressures on you from all different directions - pressures on your attention, not just pressures from different constituencies. And so you have to be pretty focused about where can you have the biggest, quickest impact.

No U.S. soldier ever dies in vain because they're carrying out the missions of their commander in chief. And we honor all the service that they've provided. Our troops have performed brilliantly. The question is for the next president, are we making good judgments about how to keep America safe precisely because sending our military into battle is such an enormous step.

It was basic research in the photoelectric field-in the photoelectric effect that would one day lead to solar panels. It was basic research in physics that would eventually produce the CAT scan. The calculations of today's GPS satellites are based on the equations that Einstein put to paper more than a century ago.

Of all the rocks upon which we build our lives, we are reminded today that family is the most important.

That applies, by the way, even to some of the folks who are now [Donald] Trump supporters. They're responding to a fictional character named Barack Obama who they see on Fox News or who they hear about through Rush Limbaugh.

Ask Osama bin Laden and the 22-out-of-30 top al-Qaida leaders who've been taken off the field whether I engage in appeasement. Or whoever is left out there, ask them about that.

You [Bill Maher] seem to have done alright with your TV show... I mean, I don't get a sense... to the extent that they're boycotting you, it's because of your other wacky views rather than your particular views on religion.