Small objects can show that gravity is real.
The Cavendish experiment proved that even tiny masses pull on each other, showing gravity works everywhere, not just between planets.
Stokes' Theorem, distilled:
The line integral of F around any closed curve C equals the surface integral of curl F over any surface S it bounds.
Every circulation on the boundary is accounted by the net "swirl" inside.
∮_C F · dr = ∬_S (∇ × F) · dS
Taylor series is the greatest gift humanity could have hoped for.
Brook Taylor was an English mathematician who founded finite differences, introduced integration by parts, and discovered the famous Taylor expansion.