I've read the average child laughs about 300 times a day, the average adult around 15.  Being a mom with little boys I don't have much doubt, it's true.

Henry is three.  His favorite word is armpit. He walks around the house like he knows the funniest secret in the world shouting, "Armpit! Armpit" Sometimes it's too much for him, and he falls to the floor in hysterics.

Other times he says "Mom?  Mom?"

"What?" I say.

"Knock-knock."

"Who's there?" (I know what's coming. How could I not?)

"Armpit. Armpit. Armpit."

He laughs and laughs and laughs. His laughter makes the rest of us laugh.

Recently, I came across this video of Solomon. It was taken years ago, we were at a friend's party and a little girl was riding a scooter. Each time the little girl scooted by us Solomon roared. Although I've seen it dozens of times it still makes me laugh.

Solomon loves seeing it. When he watches it, he's older laughter mixes with his baby laughter. It's a beautiful chorus.