White House science/technology extravaganza

From President Obama firing marshmallow cannon to cool robots, the White House-hosted Science Fair showed off all manner of future technologies
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Credit: REUTERS/Kevin Lamarque

President Barack Obama hosted the second White House Science Fair this week which brought together student winners of a range of science, technology, engineering and math competitions from across the country. The highlight had to be Obama firing the marshmallow cannon, but here we take a look at some of the other cool stuff.

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