Buttons make the world go round. How else would you tell an elevator to whisk you up to the sixth floor, or get a candy bar out of a vending machine? Buttons are the simple interface for how we interact with more complex technology. They cover up the wires and inner workings of your TV and microwave, and make tech accessible at, you guessed it, the push of a button. Rachel Plotnick, author of “Power Button: A History of Pleasure, Panic, And the Politics of Pushing,” explains the origin of buttons, their role throughout history, and how they continue to evolve in our world today.

We also have an update for our segment about WWI from a couple of weeks ago.