Every single human being who banks over the Internet, which, given how banks work now, is every single human being who has funds in a modern money economy.
I know, I know, but it's my favorite example: Number theory was held up as the exemplar of math-for-math's-sake pure mathematics until suddenly it was the foundation of cryptography. In the words of Chuck Berry, "Goes to show you never can tell."
Every single human being who banks over the Internet, which, given how banks work now, is every single human being who has funds in a modern money economy.
I know, I know, but it's my favorite example: Number theory was held up as the exemplar of math-for-math's-sake pure mathematics until suddenly it was the foundation of cryptography. In the words of Chuck Berry, "Goes to show you never can tell."