Evangelista Torricelli

1. Torricelli's Law

Describes the speed of fluid flowing out of an opening.

$$ v = \sqrt{2gh} $$

2. Torricelli's Trumpet (Gabriel's Horn)

A geometric figure with infinite surface area but finite volume.

$$ V = \pi \int_1^\infty \frac{1}{x^2} dx = \pi $$