the.com/derivative
the slope of a heartbeat, the math that catches motion mid-flight.
birth feudNewton and Leibniz fought bitterly over who invented it
hidden everywherespeedometers compute it in real time
limit trickdivides nearly-zero by nearly-zero and survives
market borrowfinance stole the name for billion-dollar bets
layeredderivatives of derivatives describe acceleration and jerk