Study says yawning definitely different from regular mouth-opening in scans
(Newser) -
Ahh, the life of a growing baby—so tiring! New 4D scans of 15 fetuses found that fetuses do actually yawn while in the womb, ScienceDaily reports. But it's actually not because they're tired, the lead researcher says; rather, "the frequency of yawning in the womb may...