Or heads. Actually, this is one of those confusing things. When you're talking about what side of the coin, even though I've been not doing this consistently, I'm tempted to say if you're saying 1, it feels like you should do the singular, which would be head, but I read up a little bit of it on the internet, and it seems like when you're talking about coins, you really should say 1 heads, which seems a little bit difficult for me, but I'll try to go with that. So what is the probability of getting exactly 1 heads? And I put that in quotes to say, well, we're just talking about 1 head there, but it's called heads when you're dealing with coins. Anyway, I think you get what I'm talking about. Now to think about this, let's think about how many different possible ways we can get 4 flips of a coin.