Human Hist News Today

>> 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. its going to be surprising to hear there are so many people who arent 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 so...