"That doesn't actually make sense, does it? Because a big unripe kiwi is hard and astringent. These are tiny and sweet. They must not be the same fruit. Good thinking." We did some digging.
It turns out that kiwi berries are related to kiwi fruit, but they are different. They have green skin and are about the size of a large grape. Other facts: They have no fuzz; they thrive in cold climates, growing in Siberia, Northern China, and Korea; and they are high in vitamin C.
I picked up a pint at Whole Foods. I'll have to keep an eye out for more of them. They are delicious!