ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

Who were the first Americans, and when did they arrive? Did they get here by land or sea? Did a single group populate the continent, or did many? Exciting recent finds at sites have triggered new theories. Alan Alda tries to find out who's saying what, and why.

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

Why do some memories slip away, never to return, while others leave a permanent mark?

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

Alan Alda visits the research labs and testing tracks of the Big Three automakers to find out what people will be driving 10-20 years from now.

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

Melting glaciers, drunken forests and disappearing lakes - "Hot Times in Alaska"examines what happens when the climate heats up and why rising temperatures are cause for alarm.

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

Alda meets scientists who are looking at the titanic struggle between dark matter and dark energy to figure out how our universe came to be and what might eventually become of it.

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

This episode looks at the past, present and future for the deep sub Alvin.

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS

This program visits with an engaging if unruly bunch of cousins that we formally broke up with about six or seven million years ago.

ALAN ALDA IN SCIENTIFIC AMERICAN FRONTIERS