As it turns out, brain size can be calculated by the way a person yawns.
About this information T4 reported, URA-Inform reports.
Scientists have long established that yawning aims to protect the brain from overheating. When a person yawns, it helps cool the brain, which helps it function more effectively.
However, researchers were interested in whether more information could be gleaned from observing yawning.
Recent experiments involving dozens of species of mammals and birds showed that the duration of yawning is directly related to brain size. The larger the brain, the longer it takes to cool down, and such animals yawn longer.
This theory is supported by evidence that mammals yawn longer than birds. Birds have a higher core temperature than mammals, meaning there is a greater temperature difference with the surrounding air. Therefore, birds only need a shorter yawn to get cool air.
Scientists also suggest that people with more neural connections tend to yawn more often because their brains heat up faster.
Recall that it was previously reported that scientists managed to recreate the face of an ancient Egyptian mummy (photo).