Obama launches marshmallow from cannon at White House Science Fair

"The Secret Service isn't happy about this," the president joked as he worked with the student to prepare the marshmallow for takeoff.

After perusing the science projects of more than 100 students from across the county, the president took Tuesday's White House Science Fair as an opportunity to announce his multimillion-dollar plan to improve the nation's science and math education programs, a move he said that will "get America in shape to win the future."