Ever wondered why bottle caps have those ridges? The answer goes back to the 1920s and a clever anti-theft design. Bartenders were stealing tin during Prohibition — tin was worth about $0.12 per ounce, serious money for a worker earning just $3 a day. Bottle makers fought back by adding ridges that would crack if shaved. Now we still use them 100 years later. #shorts #history #explained
0:00 The mystery
0:12 Why they stole
0:32 The solution
0:48 Still using it today
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