The 7 Most Terrifying Experiments Ever Conducted

Published May 16, 2015
Updated December 23, 2024

Britches at UC Riverside

Poor, poor Britches. We at All That Is Interesting are humanists, believers in science and progress. But sometimes that progress comes at a grisly, terrifying cost. Britches the monkey is a prime example of that cost. (WARNING: The following image is nightmare-inducing.)

Britches the monkey with eyes sewn shut

Britches, who was not born blind, made blind. Source: PETA

At face value, the cause was noble–researchers needed access to blinded monkeys so they could test out a brain-implanted sonar device that would improve the lives of patients without sight. Some non-sighted people like Ben Underwood have impressively developed a sort of echolocation, clicking their tongue to map their surroundings.

The transcranial device tested on Britches the monkey was designed in the hopes of giving that gift of echolocation to blind patients everywhere. The trouble was, Britches was not blind. Scientists had to make him blind to test their product, and they did so by sewing his healthy eyes shut.

author
Chris Altman
author
Chris Altman is a freelancing writer and artist based out of Brooklyn, NY.
editor
Maggie Donahue
editor
Maggie Donahue is an assistant editor at All That's Interesting. She has a Master's degree in journalism from Columbia University and a Bachelor's degree in creative writing and film studies from Johns Hopkins University. Before landing at ATI, she covered arts and culture at The A.V. Club and Colorado Public Radio and also wrote for Longreads. She is interested in stories about scientific discoveries, pop culture, the weird corners of history, unexplained phenomena, nature, and the outdoors.
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Altman, Chris. "The 7 Most Terrifying Experiments Ever Conducted." AllThatsInteresting.com, May 16, 2015, https://allthatsinteresting.com/terrifying-science-experiments. Accessed January 31, 2025.