Radio 4 in Four - Why is yawning catching? - ÃÛÑ¿´«Ã½ Sounds

Radio 4 in Four - Why is yawning catching? - ÃÛÑ¿´«Ã½ Sounds


Why is yawning catching?

Is yawning really as contagious as we think or does it depend on who's doing the yawning?

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