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Kourosh Kalantari-Zadeh

Professor of Engineering at the University of Sydney; inventor of ingestible gas-sensing capsule and pioneer in 2D semiconductors and liquid metals.

Jun 23, 2026

Imagine This

Imagine This

FAN FAVE: Why do farts come out of your bum?

Jun 23 · 13m

NijHOST
5:06
What's the other reason?
Kourosh Kalantari-ZadehGUEST
5:07
Well, the acid in your stomach is very strong.
Kourosh Kalantari-ZadehGUEST
5:11
It helps break down food and kill any bad bacteria.
Kourosh Kalantari-ZadehGUEST
5:16
But when you mix stomach acid with certain foods and drinks, like fizzy drinks, you can create lots of gas, which comes up out of your mouth as a burp.
Kourosh Kalantari-ZadehGUEST
5:28
[burp]
speaker_1VOICE_ACTOR
7:17
Is it longer than a giraffe?
Kourosh Kalantari-ZadehGUEST
7:19
No, the large intestine is shorter than the small intestine, but it's still pretty big, about one and a half meters long.
Kourosh Kalantari-ZadehGUEST
7:29
Any food that hasn't been broken down by the small intestine arrives here to be feasted on by millions or trillions of bugs.

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