WETA-TV (Television station : Washington, D.C.) Department of Educational Activities Search this
1 videorecording (58 min.) : sd., col. ; 1/2 in
Intended audience: Adults.
Historian David McCullough hosts this exploration of the mystery of time, focusing on the evolution of the sea urchin, the development of the modern calendar, the hidden "alarm clock" in bamboo, and other examples.