CPR

So the other day, we were at church and I look over to see Ellie Mae on the ground, with Molly pushing on Ellie Mae's stomach. This is the conversation that entails...

Me: "Molly, be careful! You have to be gentle with Ellie Mae!"
Molly: "Mom, I'm doing CPR..."
Me: "Pardon me?"
Molly: "I'm doing C P R...."
Me: "Did you just say CPR?"
Molly: "Yes. I am doing CPR on Ellie Mae!"

Here are the baffling parts of this story:

1. I don't know CPR
2. I've never talked to my girls about CPR
3. Where did they learn this?!
4. Molly is THREE!