Who needs peanut butter or caramel when you can fill your chocolate bar with radium? Sold by Burk & Braun of Germany from 1931 to 1936, this candy was promoted for "its rejuvenation power," believe it or not. But apparently this was normal back then—people had some strange notions about radium's "therapeutic" qualities, adding it to everything toothpaste to baby blankets. Not exactly the same as putting the other kind of coke in Coke, but not far off either.

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