The Ig Nobel Prizes honor achievements that make people LAUGH, then THINK.

In the Ig Informal Lectures, some days after the ceremony, the new Ig Nobel Prize winners attempt to explain what they did, and why they did it. We released these lectures one at a time.

In Podcast Episode #1093, Marc Abrahams presents the 2021 Ig Nobel Prize for Physics winners Alessandro Corbetta, Jasper Meeusen, Chung-min Lee, Roberto Benzi, and Federico Toschi. They received the prize for conducting experiments to learn why pedestrians do not constantly collide with other pedestrians.

• REFERENCE: “Physics-based modeling and data representation of pairwise interactions among pedestrians,” Alessandro Corbetta, Jasper A. Meeusen, Chung-min Lee, Roberto Benzi, and Federico Toschi, Physical Review E, vol. 98, no. 062310, 20188.

The video for this lecture—graphs, charts and all—can be found online at www.IMPROBABLE.com.

Seth Gliksman, Production Assistant

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