“Happy Birthday” may be the Hill sisters' main claim to fame, but Patty (left) and Mildred's (right) impact on American history extends far beyond the beloved song. Illustration by Meilan Solly / ...

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Sure, there’s nothing wrong with the traditional celebratory sing-along “Happy Birthday to You,” first published in 1893, but sometimes birthdays need a bit more oomph, and are tied to some deeper ...