This is berry confusing

Still trying to digest (pun fully intended) the concept of the pumpkin as a fruit, not a vegetable, I now am told the eggplant is … ready for this? … a berry.
Just like blueberries, strawberries, and blackberries?
Well …
I heard this preposterous claim about the eggplant on a cooking program my wife was watching on TV so I looked it up, and sure enough, scientists, at least the ones quoted on livescience.com, verify the eggplant as a berry.
According to the website, berries fall under the general category of fruits. “To botanists,” the site explains, “a berry is a fleshy fruit that has multiple seeds on the inside, embedded in the flesh of the ovary, such as a blueberry.”
Personally, I find this a little too technical, and just a tad off-putting. Do they have to get into the ovaries of plants?
Based on this definition, the website lists blueberries, tomatoes, grapes, persimmons, chili peppers, and, yes, eggplants as berries.
Know what it does not list? Strawberries, blackberries and raspberries.
“They are aggregate fruits,” the site claims, “because they form little fruitlets from many ovaries (there’s that word again) that remain separate, rather than being fused into a single structure.”
So, the eggplant, which has nothing to do with eggs, is a berry, and the strawberry, which has nothing to do with straw but does have berry in its name, is not.
I did find something on food.com that might explain the whole thing. The eggplant was once considered poisonous and called the “mala insane,” or “raging apple,” because is was “believed to cause insanity.”
I can sort of see why.

Ed Ackerman