Wonder plant 8
Today story: A plant has no use outside of being weird (Like in circus show lol)
It is called miracle berry, belonged to Sapotaceae family (same as lucuma)
The red berry contain miraculin, which turn sourness into sweet for a time before washed out by saliva

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The berry is common in West Africa countries (like Benin). People use it to add sweetness to palm wine or sour bread. The mechanism behind miraculin is when you taste sour food (low pH) it activate and trick your tongue to feel sweetness