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

With this weird ability, this berry has potential to be used as sweeteners f. But it need much more research before that. So far, people only use it for fun. Vendors sell to curious people as ornamental trees. You may see in the picture, they called it "cay than ki"

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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