I really like plums. Several days ago I picked up several from the grocery, but when I tasted one, it was hard and too sour. Like most fruit, plums are picked before they are ripe, so they will make it to the grocery without getting mashed. What I needed was a way to get the plums to ripen quickly. Luckily, with a little science, it is easy. You can try this too. You will need:

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