# The math-solving horse who fooled scientists still haunts AI research

> Source: <https://boingboing.net/2026/07/27/clever-hans-horse.html>
> Published: 2026-07-27 13:00:00+00:00

In early 1900s Germany, a math teacher named Wilhelm von Osten toured the country with [Clever Hans](https://en.wikipedia.org/wiki/Clever_Hans), a horse who could apparently add, subtract, multiply, divide, tell time, and answer questions like "If the eighth day of the month comes on a Tuesday, what is the date of the following Friday?" — [Read the rest ](https://boingboing.net/2026/07/27/clever-hans-horse.html)

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