Science explained in 3 minutes

Science in 3 Minutes

One real science question, answered in 3 minutes. Physics, biology, space, the human body, technology and the stories behind the discoveries, with real numbers and real sources.

Visit Channel

Latest videos

Watch on YouTube →

How Leeuwenhoek Saw Bacteria in 1676 With One Glass Bead

Why does freezing water burst steel pipes? #Shorts

Why Do Onions Only Attack When Wounded? #Shorts

Why Do Onions Really Make You Cry? #Shorts

Why a cold onion barely makes you cry #Shorts

2002: The Enzyme That Turns Onions Into Tear Gas

Articles

See all articles →

October 31, 2026 • onions

Why Onions Make You Cry: The Enzyme Behind the Tears

Why do onions make you cry? The real chemistry: alliinase, a second enzyme found in 2002 (LFS), a tear-gas molecule built in under a second, the TRPA1 receptor in your cornea, and the kitchen tricks that actually work.

Read article →

Visit Channel →

← All channels