Video: President Obama Fires Marshmallow Cannon

At the 2nd Annual White House Science Fair today, President Obama announced his goal of preparing 100,00 teachers to train 1 million science, technology, engineering and math graduates over the next ten years.

More than a hundred students from across the country participated in the fair, which included a Skype robot, a portable disaster shelter and a marshmallow cannon, which President Obama tried his hand at firing (video below).