I'm going to start with a fair coin, and I'm going to flip it 4 times. Flip it 4 times. And the first question I want to ask is, what is the probability that I get exactly 1 head? 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?