I feel like most people got too complicated where a kid wouldn’t understand. Wasabi/Horseradish activate the same cold receptors in the tongue that are present throughout your body and they usually respond to temps lower than 17° Celsius. Hot sauce is the opposite, and activates receptors in your tongue that imitate Hot sensations. Wasabi/horseradish: Cold. Hot sauce: hot.
Edit: These are all great comments and very scientific, but no other comment mentioned how horseradish/wasabi activate the same receptors and painful cold temperatures do. I hope you guys get a chance to read this so more people know!
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