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Sharp Knives Cut Onion Tears: Study Reveals Secrets

10/27/2025

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Summary

Story summary

Sharper knives reduce tear-inducing droplets when cutting onions, according to a study in the Proceedings of the National Academy of Sciences (PNAS).
The study shows quick cuts with dull knives launch onion juices nearly 40 meters into the air, while sharp blades minimize this release.
Navid Hooshanginejad, the study's lead researcher, notes the technique informs how pathogens spread in biological systems and has broader implications for fluid dynamics.

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Story summary

Sharper knives reduce tear-inducing droplets when cutting onions, according to a study in the Proceedings of the National Academy of Sciences (PNAS).
The study shows quick cuts with dull knives launch onion juices nearly 40 meters into the air, while sharp blades minimize this release.
Navid Hooshanginejad, the study's lead researcher, notes the technique informs how pathogens spread in biological systems and has broader implications for fluid dynamics.