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Hippocampus: A part of the brain that is important for learning and memory.

Or this:

a free online educational resource from the United States of America

HippoCampus is set up to be homework and study help. They have graphic and audio content suitable for people working with a variety of reading skills covering these topics:

Algebra
American Government
Biology
Calculus
Calculus (Spanish)
Environmental Science
Physics
Psychology
Religion
US History

Instructors can also create their own custom HippoCampus pages. Canadian content anyone?