【新朋友】点击标题下面蓝字【可可英语】加关注【老朋友】点击手机右上角图标【转发分享】内容This is Scientific American — 60-Second Science. I'm Christopher Intagliata.A baby's laugh is unmistakable: (CLIP: baby laughter) But aside from its squealing, high-pitched quality, there's another factor that sets a baby's laugh apart from ours: babies laugh on the exhale AND the inhale. Whereas adult humans "tend to laugh predominantly on the exhale. The classic kind of ha-ha-ha." Disa Sauter, a psychologist who studies emotions at the University of Amsterdam. Sauter and her colleagues collected 44 samples of babies laughing, from the ages of 3 months... (CLIP: 3 months) to 10 months... (CLIP: 10 months) all the way up to 18 months. (CLIP: 18 months)They played the samples for about 100 untrained volunteers, and asked them to deconstruct the la
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