National Geographic stories take you on a journey that’s always enlightening, often surprising, and unfailingly fascinating.

Hypercalcemia occurs when a person has too much calcium in their blood. There are multiple possible causes. Learn how hypercalcemia affects the body and how to reduce calcium levels.

Curriculum-linked learning resources for primary and secondary school teachers and students. Videos, games and interactives covering English, maths, history, science and more!