Longer yawns may correlate to bigger brain size, claims study
Further, researchers say that the animals with bigger brain tend to be more variable in the length of their yawns.
Oct 09, 2016, 19:00 PM ISTWhy do we yawn? Know the truth behind this reflex!
No one knows exactly what causes people and animals to yawn.
Jun 02, 2016, 13:31 PM IST