One neat thing about having a daughter who's a science teacher is what you learn about things you thought you already knew everything about. For instance, broccoli. Did you know that broccoli is a fractal? I didn't know that; in fact, I had to look up fractals in the dictionary. A fractal is a never-ending pattern, in which each part is self-similar across different scales. In other words, each broccoli floret, large or small, is a miniature of the entire head of broccoli. Isn't that fun? Even more fun, broccoli florets are tender enough not to need cooking, which is a hit with me when the weather gets hot. In this double broccoli salad recipe, I use store-bought broccoli slaw -- the shaved stems of broccoli and carrots, with bits of red cabbage -- with chopped broccoli florets, and bind it all together with a spicy-sweet Sriracha yogurt dressing. Bring this salad to a picnic or potluck this summer, and it will be the first dish to disappear.