Time is running out for Iran to address the international community's growing concerns about its nuclear program.

We have to be successful at the cutting-edge industries of the future like Twitter. But we also have always been a country that makes stuff.

Young people: I understand this is important to you, but as you be thinking about climate change, the economy and jobs, war and peace, maybe way at the bottom you should be thinking about marijuana.

I don't think that there's a hard-and-fast deadline. . . .What we have said all along is that this is not an open-ended process, we are not in this just to talk for talk's sake. . . . We expect prompt, concrete steps to be taken over the next couple of weeks.

I am not in favor of concealed weapons. I think that creates a potential atmosphere where more innocent people could (get shot during) altercations.

For the first time in our history, the winners of the White House Turkey Pardon were chosen through a highly competitive online vote. And once again, Nate Silver completely nailed it. The guy is amazing.

We know that every father has a personal responsibility to do right by their kids - to encourage them to turn off the video games and pick up a book; to teach them the difference between right and wrong; to show them through our own example the value in treating one another as we wish to be treated. And most of all, to play an active and engaged role in their lives.