http://cpr94.livejournal.com/ ([identity profile] cpr94.livejournal.com) wrote in [personal profile] mmcirvin 2006-12-18 05:05 pm (UTC)

Everything's always both genetic and environmental. That's my rule of thumb.

If I recall correctly, laughter as humans know it has some serious anatomical prerequisites. I believe one of them is even an upright posture.

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