Not sure if you're laughing, or crying... or both? A new documentary says science may have your back.

All in a Weekend Montreal

From the moment we're born, and before we learn to speak, we humans laugh and cry. Both are hard-wired into our DNA, and according to a new The Nature of Things documentary by Mike Downie, laughing and crying are widespread across the animal kingdom. Downie has stopped by the program to tell us what it can mean when we laugh and cry, and what we can learn from it.

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