There is evidence of a solar minimum in this painting The article says whatever about selective breeding BUT the update at the very end explains this happens to all breeds of watermelons that are grown in subpar conditions. It’s called starring or hollow heart and it happens due to poor pollination and growing conditions like storms earlier in the season that inhibit bees, colder temperatures, and not enough sunlight (grand solar minimum conditions). The painting showing a watermelon with hollow heart has an estimated date of 1645-1672, right in that minimum