Ana Swanson

Treasury Secretary Jacob J. Lew announced the most sweeping and historically symbolic makeover of U.S. currency in a century, proposing to replace the slaveholding Andrew Jackson on the $20 bill with Harriet Tubman, the former slave and abolitionist.

There are tons of workers who will have part of their jobs taken away by automation. That category includes not only low-paid workers, but the most highly paid jobs in the U.S. - including doctors, hedge fund managers and CEOs.

People often like to groan about how their job is "killing" them. Tragically, for some groups of people in the U.S., that statement appears to be true.