Nightly News | December 08, 2011
BRIAN WILLIAMS, anchor: You know how contagious yawning can be? A new Italian study has found we catch it most from members of our own family and not because we find them boring. The research shows there's a longer yawn delay if you don't know the yawner. They say the reason might be empathy, how you feel toward your own kin, that causes the urge to yawn when a family member does it.