These four kids have discovered the secret to happiness ... and they agreed to share their knowledge with us.
They know what to do when you're happy and you know it, how to turn a frown upside down and the truth behind the saying, "A laugh a day keeps the doctor away."
When asked if life is better when you smile, they all confidently responded "YES!" One girl even said, "Yes, because it brings joy to the world."
But they aren't only smart, they're also pretty funny.
One kid told a joke: "What's a bird's favorite paper?"
Watch the video above to find out the answer!