There's a reason why the question "It's 3. a.m. Who do you want answering the phone?" became a constant refrain of the 2008 election. The presidency is an all-hours, no-holds-barred job, and all that work and all that stress take a pretty significant toll on our leaders.
And if a time-lapse of President Barack Obama created by YouTube user Diran Lyons is any evidence, he's no exception. The video, above, races through a series of photos taken of Obama since he took office in 2009. And even though his expression remains pretty much the same throughout, the difference...
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