Remember that Hour of Code event we mentioned earlier today? The one that had President Barack Obama hosting a computer science workshop at the White House? Turns out the president used the event to mark a new milestone in American history: He's now the first US president to write a computer program. Specifically, the president used Google's Blockly tool to craft a tiny segment of code to draw a square. It's not a very useful program, but its creation is symbolic of the event's message -- with a little effort, anybody can learn to code. Even one of the busiest men on the planet.

[Image credit: AP Photo/Jacquelyn Martin]