43: Six unopenable letterboxes
Lateral with Tom Scott
00:00
CD's frame rate and alternate sound tracks
You can change the frame rate or equivalent term for CDs to get two alternating sets of sounds. Different tracks are put in the left and right channels, allowing you to listen to different songs depending on which side you play. It's like a weird hack that lets you hear all the songs. Some CDs even have a track called Proverbs 2 with concert announcements.
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