We’re on the brink of a future beyond what we can fathom — a future with driverless cars, designer babies, intelligent robots, and digital doppelgangers. Who will you choose to be in that future? How will it change you?

From Hong Kong to Istanbul to New York, libraries are one of the defining elements of 21st-century demonstrations, says techno-sociologist Zeynep Tufekci, and they can help illuminate why people risk discomfort, arrest and danger to stand together.