Robert Jan Van Pelt says:
Ninety-nine per cent of what we know we do not actually have the physical evidence to prove . . . it has become part of our inherited knowledge.
http://www.fpp.co.uk/Auschwitz/Pelt/99_ ... roved.html
"Inherited knowledge" but no proof. Now there's a way to spin a phrase!
...........what is the 1% of physical evidence they do have?