CBC News
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You’ve been cutting your onions all wrong
Posted
April 2, 2026
Views
15,533
Likes
279
Engagement
1.80%
April 2, 2026
15,533
279
1.80%
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2:30Now PlayingWould you like to know how to reduce the tears while cutting an onion? New research reveals that chopping an onion is actually a high-speed fluid dynamics event -- and your dull knife is likely to blame. CBC’s Johanna Wagstaffe looks into how scientists, using high-speed particle tracking, confirmed just how impressive the spray from an onion is, and the way the layers react to a blade can essentially launch a sulphur-rich mist directly at your face.
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