Let us take a moment to honor the unsung villains of the human body — the sinuses, four hollow spaces in the skull, designed ...

During this time, their bone-enclosed sinuses reduced and they developed sinuses and air sacs outside of their skulls. This would have alleviated increases in pressure during deeper dives ...

Their bone-enclosed sinuses reduced, and they developed sinuses and air sacs outside of their skulls. These external features would have aided in pressure regulation during deep dives, protecting ...