Obama talking to one of the exhibitors
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Obama smells smoke at Science Fair prompting British joke

Over 100 students from 30 states exhibited their award-winning science projects at the 5th White House Science Fair on Monday.

But one project in particular caught President Obama's attention, when the stench of something burning interrupted his speech.

The president remained calm, cracked a few jokes and ultimately gave the students a history lesson - with a British bent.

Produced by the BBC's Paul Blake