"It's popping"

There was a fine drizzle of rain falling when we woke up this morning. Dex looked out the patio doors and said "it's popping." I looked and I knew exactly what he meant. The rain was so fine we couldn't see it falling, but we could see the effects of rain -- the pools of water "popped" every time a drop of rain hit it. Where would we be without little children to help us see the world more clearly?