Prophylactic cranial irradiation (PCI) is a type of radiation therapy used to prevent the spread (metastasis) of lung cancer from the lungs to the brain. It is also used in certain types of childhood ...

Macronaria, a group of mostly colossal sauropod dinosaurs, comprised the largest terrestrial vertebrates of Earth’s history. However, some of the smallest sauropods belong to this group as well. The ...