Your social media feeds may be full of the faces of crestfallen kids posing for their obligatory back-to-school photos, but what has become an annual rite of passage was a rarity a century ago. In 1900, only 51 percent of kids aged 5 to 19 were enrolled in school.

In the latest edition of The List Show, Mental Floss editor-in-chief Erin McCarthy is sharing dozens of ways school was different in America 100 years ago.

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