After the war, interest in the hollow pit design was revived.

A VECSEL is a vertical cavity, and is composed of two mirrors.

Pneumoperitoneum is the presence of air or gas in the abdominal (peritoneal) cavity.

The eastern rock nuthatch builds a similar but less complex structure across the entrance to a cavity.

The nasal cavity is unique, as the only place where brain cells (neurons) are directly exposed to the environment.

In some cases, the sinus cavity can be irrigated with saline (antral lavage) and the tooth fragment may be brought back to the site of the opening through which it entered the sinus, and may be retrievable.

a bloodless circumcision device for adults, will be tested in at least nine African countries in the next year a two nurse team slides a grooved ring inside the foreskin and guides a rubber band to compress the foreskin in the groove.

So practicing throwing things has been shown to stimulate the frontal and parietal lobes, which have to do with visual acuity, 3D understanding, and structural problem solving, so it gives a sense it helps develop their visualization skills and their predictive ability.