"I am a camera, a phone, a computer, a map, a clock, and a library — all in your pocket. Thirty years ago I did not exist. Today people panic without me. What am I?"

Answer: A Smartphone. The smartphone combines dozens of previously separate devices into one. It was invented in the mid-1990s and became dominant in the 2000s and 2010s. People experience genuine anxiety when separated from their phones.