How do you prove the Holocaust happened? And should you have to?
In 1996, Deborah Lipstadt was tasked with proving the Holocaust happened in a trial that's the focus of the new film, "Denial."
Yep, you read that right. Holocaust denial is actually a thing.
Many of us know that from 1933 to 1945 up to 6 million Jewish people lost their lives during the Holocaust, and more than 11 million people were killed altogether. We have photographs of the concentration camps, the ruins of which are still around today and can be visited. We have testimony from Nazi officials. There are survivors with arm tattoos and eyewitness accounts of the tragedy.