Presents 24 lectures dealing with both philosophical and historical considerations for the idea of a natural moral law and its basis in our common human nature.

Dr. David Christian, Professor of History at San Diego State University surveys the past at all possible scales, from conventional history, to the much larger scales of biology and geology, to the universal scales of cosmology.

A broad survey of American intellectual history ; a history of the ideas, the thinkers and the institutions that have mattered most to Americans. Lectures 1- 36.

With frequent stops at pop culture meccas, and unforgettable encounters with humans of singular interest, the NPR Road Trips series introduces listeners not only to far-off locations and unusual destinations, but to the people who inhabit them, and seek them out. Each story focuses on real locations, real people, and real history in the thought-provoking, imaginative and entertaining way listeners have come to expect from NPR.