the.com/modulus
the leftover after division, quietly running your clocks, crypto, and every wraparound on Earth
clock math12-hour clocks are modulus arithmetic in disguise
crypto backboneRSA encryption lives entirely inside modular arithmetic
named byGauss formalized it in 1801, age 24
hidden everywherehash tables, checksums, and ISBN digits all use it
the symbolprogrammers write it as percent sign