There’s a few important things to know about designing and selling a product, Gardner School first-grader Aubrey Silbernagel said. One: Whatever you’re making can’t be too big, so people can carry them home. Two: Everyone has to like it, “not just your gender.” And three: “In my case, make everything cute,” Aubrey said. Aubrey shared that bit of wisdom sitting behind a table covered in popsicle-stick frames and “puff ball guys” — fluffy balls covered in googly eyes and felt features.