The 'Lucy' fossil skeleton is one of the best-known finds in anthropology. Now, researchers have found a skeleton of the oldest known upright-walking animal, thought to be even older than Lucy's 3.2 million years. Join Ira and his guests in this hour of Science Friday for a look at the new hominid skeleton find.

Plus, a happy 126th birthday to Albert Einstein -- we'll look back at him as scientist and as person.

Finally, we'll take a look at a new way to browse the web. Since it was released last November, the Firefox web browser has been downloaded over 26 million times. Although Microsoft's Internet Explorer software still holds a dominating lead in the web browser market, Firefox, an open-source program freely available from the Mozilla Foundation, is making impressive gains. We'll talk about why Firefox is on the rise.

Call in with your questions and comments at 1-800-989-8255 (3-4 Eastern). Teachers, find more information about using Science Friday as a classroom resource in the Kids' Connection.

Guests:
Bruce Latimer
Executive Director
Cleveland Museum of Natural History
Cleveland, Ohio

Dennis Overbye
Science Correspondent at The New York Times
Author, 'Einstein In Love' (Viking Adult, 2000)
New York, New York

Mitchell Baker
President, Mozilla Foundation
Mountain View, California

Books/Articles Discussed:

'Einstein In Love' by Dennis Overbye. Viking Adult, 2000.

(find books discussed on previous broadcasts)

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This segment produced by Charles Bergquist and Todd Neale