Wednesday links

On March 30, 1848, Niagara Falls Ran Dry, with bonus Niagara Falls sketch by Abbott & Costello and The Three Stooges.

Before computers: Inside the FBI’s Colossal Fingerprint Factory.

In this 2.5 minute video, Carl Sagan lucidly explains how Eratosthenes not only deduced a spherical earth, but accurately calculated its diameter in 200 B.C.

For Van Gogh’s birthday, his recently-discovered sketchbooks and the unexpected math behind "Starry Night"

Prozac in the Water Makes Fighting Fish More Mellow.

The Demonic Origins of Ventriloquism.

ICYMI, Friday's links are here, and include the history and calculations behind Easter's varying dates, a gallery of Easter bunnies terrifying children, and a collection of videos of violence against marshmallow peeps.