Paying attention to history might, it is hoped, prevent us from repeating it. So new generations of people need to understand what happened to previous generations, like the millions of people who died at the hands of Nazi Germany in the Second World War.
Michael Gruenbaum was nine years old when the war started, and he went to a concentration camp before it was over. He wanted to share his memories in written form, but for a younger audience.
The result is a book with co-writer Todd Hasak-Lowy called Somewhere There Is Still a Sun: A Memoir of the Holocaust.
The authors visited in 2015, and we return to their interview here.