If you play an audiotape of a yawn to blind people, they'll yawn too.


The Tipping Point: How Little Things Can Make a Big Difference (ed. Little, Brown, 2006) - ISBN: 9780759574731


If you play an audiotape of a yawn to blind people, they'll yawn too.

If you play an audiotape of a yawn to blind people, they'll yawn too.

If you play an audiotape of a yawn to blind people, they'll yawn too.

If you play an audiotape of a yawn to blind people, they'll yawn too.