Frank Siller of Tunnel to Towers remarks on young people and 9/11

Frank Siller stopped in Easton, PA on his Never Forget Walk - Commemorating the 20th Anniversary of 9/11 on September 4, 2021.
I asked what he would tell young people who weren't around in 2001.
Frank Siller, brother of NYC firefighter Stephen Siller and CEO of the Tunnel to Towers Foundation started on August 1 at the Pentagon, walked to Shanksville, and stops in between, and will end his 500+ walk on 9/11 in NYC, tracing his brother's steps to Ground Zero.