Blueberries are berries. The weight of single fruit is 0.5~2.5g, and the seeds are very small. A single fruit contains about 500 to 600 seeds and is edible. If you mention that there is a nucleus, and you bite it open, it means that the nucleus has a certain volume and something red. I guess it's not blueberries, because blueberry seeds are too small to even put your teeth in, so you can't bite them. Secondly, the red juice of blueberry comes from the peel, not the stone.