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Stefanie Chiras is the channel chief at IBM subsidiary Red Hat, which also owns Ansible.

Sons who were firefighters themselves. in 2001, larry stack was considering retirement. >> while they were looking at the first tower burning, the plane hit the second one. he put the binoculars down. of he looked at the guys and he said i think they're going to need us now. >> stack was helping an injured man when the buildings came down. >> typical of the kind of man he was. he would have never left. >> they held a funeral in 2016. burying a blood donation larry made before his death. >> it was a sight to see. >> families like the stacks are at the heart of medical examiner's work. >> we had...

>> when south tower cracked, i looked up, you were under. >> his team barely survived. it was the start of one of the most complex forensic challenges in human hist rich. 40% of the victims are still unaccounted for 20 years later. it's going to be surprising to hear there are so many people who aren't identified. >> everything that destroys dna was president at ground zero. so fire, water, sunlight, jet fuel, diesel. >> nearly 22,000 remains were collected in the years that followed. and while some families got the call, others like the stacks did not. >> i'm waiting for that phone call. wait...

Families got the call, others, like the stacks, did not. >> i'm waiting for that phone call, waiting. hey, we got -- we identified a piece but it never happens. >> reporter: larry stack was a firefighter, 32 years on the job >> he rose up to the rank of battalion chief, and loved every part of his job. >> reporter: that love transferred to his sons, who are firefighters themselves in 2001, larry stack was considering retirement >> while they were looking at the first tower burning, the plane hit the second one. he put the binoculars down, he looked at his guys, and he said "i think they're goi...

Ground zero. >> when it cracked, i looked up, and you were just under. >> reporter: his team barely survived. 20 years later, 40% of the victims are still unaccounted for. >> i think for a lot of people, it's going to be surprising to hear that there are so many people who are not identified. >> everything that destroys dna was present at ground zero, so fire, water, sunlight, jet fuel, diesel. >> reporter: nearly 22,000 remains were collected in the years that followed, and while some families got the call, others like the stacks did not. >> i'm waiting for that phone call. hey, we'd we ident...