NPR's Ailsa Chang speaks to mathematician Eugenia Cheng about the Pascaline -- a 17th-century invention credited as the first mechanical calculator.
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Ailsa Chang
Ailsa Chang is an award-winning journalist who hosts All Things Considered along with Ari Shapiro, Mary Louise Kelly and Juana Summers. She landed in public radio after practicing law for a few years.
Linah Mohammad
Patrick Jarenwattananon