The first of five clues. Each one below gives a little more away.
I store sound as one continuous scratch.
I was declared dead in the 1990s and outsold the compact disc again in 2022.
My groove, pulled straight, would run for something like half a kilometre.
Halfway through, somebody has to get up and turn me over.
A black disc, a needle, and thirty-three revolutions a minute.
Vinyl Record
An entire side is a single groove, a spiral several hundred metres long, and the needle does nothing cleverer than read the wobbles in its wall.
The audio is one continuous groove, spiralling inward for something like half a kilometre on a twelve-inch side, and the stylus simply follows the wiggles cut into its walls — side to side for mono, and at forty-five degrees on each wall for the two stereo channels. Loud passages need wider wiggles and therefore more space, so a long side is quieter than a short one, a constraint that shaped how albums were sequenced. Written off after the compact disc, it kept a small following and then returned: by 2022 it was outselling CDs again in the United States.
Reading five clues at once is not the game. In the real thing they arrive one at a time and every wrong guess costs an hour. Play mystery #40 · today's mystery · the vault
Previous: mystery #39. Next: mystery #41. Or try #11, #12, #13, #14, #15, #16.