Pulitzer Prize-winning biographer Jon Meacham on the evolution of Abraham Lincoln's moral principles and political leadership -- and what the era of Lincoln can teach us about the state of our democracy today.
The polygraph machine seeks to separate the truth from lies. But the answers it gives are inadmissible in court, and those who know how can easily trick the machine. The origins of the lie detector and what its use reveals about both subject and administrator.
- Ken Alder Professor of History and Director of the Science in Human Culture Program at Northwestern University and author of "The Measure of All Things."
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