I use this example to introduce formal and functional approaches to topics in the social sciences. Any argument you try to make within the debate ends up including a variant of “…because sandwiches [abstraction about what formally defines a sandwich]”, which itself presumes that the “right” way to carve up the world is in categories of form. You could also conceive of sandwiches functionally, where something isn’t a sandwich if we (some cultural or linguistic group) just don’t think of them that way.
From a functional view, the very fact the debate exists at all means hot dogs aren’t sandwiches, cereal isn’t soup, pop tarts aren’t ravioli, etc.
Then I make them think about it in contexts like language, Durkheim, and policy making and watch their little minds explode.
SleepPhones are great! They are super comfortable and secure (I toss and turn a lot, anything in-ear never had a prayer). I wear mine working out too.
Under-appreciated advantage over cheaper, similar competition: super easy to clean. The mechanism slides in and out of the band, which is machine washable. You’re not just building up sweat and oil might after night.