Video: The chemistry of blue jeans, the pants that changed the world

You might have a pair of them on right now, or maybe you have to wait until casual Friday. Blue jeans are among the most popular clothing items in the entire world.

But how did Levi Strauss get his "workwear," as he called it, so blue? Through chemistry, of course. This week, Reactions looks at the chemistry of everyone's favorite pair of pants.