A lioness lets out a mighty yawn to shake away the sleep. Soon after she walked away in the familiar swagger of a confident hunter and took up position under the bushes.
A lioness lets out a mighty yawn to shake away the sleep. Soon after she walked away in the familiar swagger of a confident hunter and took up position under the bushes.
Scientists from Princeton University have proposed that those cavernous yawns we all experience cause the sinuses to expand and contract like a bellows, acting to cool the brain.
Scientists from Princeton University have proposed that those cavernous yawns we all experience cause the sinuses to expand and contact like a bellows, acting to cool the brain.