US President Barack Obama fist bumps as he works with a middle-school student participating in an “Hour of Code” event to honor Computer Science Education Week at the White House in Washington

US President Barack Obama works with a middle-school student participating in an “Hour of Code” event to honor Computer Science Education Week at the White House in Washington

US President Barack Obama works with middle-school students participating in an “Hour of Code” event to honor Computer Science Education Week at the White House in Washingto

US President Barack Obama works with a middle-school student participating in an “Hour of Code” event to honor Computer Science Education Week at the White House in Washington