You can try and belittle me if you like. A passport survived the impact and resulting fireball. A flight recorder didn't.
What's scientific about that?
Simple physics. Lighter objects were thrown clear, heavier ones were not. The FDR's are also secured to the structure of the airframe, loose objects were not.
www.forbes.com/sites/quora/2017/02/13/why-wasnt-one-single-black-box-recovered-from-any-of-the-crashes-on-911/#7fde0a9f1be3
"Despite a few unsubstantiated claims—some by known attention seekers (liars) no credible sources reported the recovery of any recorders from the World Trade Center site. This isn’t that surprising. Most of the identifiable aircraft wreckage was in the form of dense, strong parts from the landing gear and engine cores, and lighter pieces that were thrown clear of the site entirely. This is part of flight 11 found several blocks away on Cedar Street:
[picture of more aircraft wreckage]
The flight recorders are unlikely to have been so lucky. Contrary to popular opinion, they are far from indestructible, and are not designed to withstand either high energy impacts (which have rarely ever occurred) or prolonged fire (the fuel spilled from a crash in open terrain spreads out, burns, and is gone).
They certainly are not meant to withstand the concrete grindstone of a hundred story building collapse. If they were inside the structure, they would have been heavily damaged, likely melted, then ground into sawdust. Certainly, they would have been torn open and the bright orange paint would have been gone. It would have taken a miracle for anyone to recognize one if it fell on an NTSB inspector’s boot.
Still, you never know. A piece of landing gear was found eleven years after the attack, wedged out of sight in a narrow gap between 50 Murray Street and 51 Park Place, three blocks away. If someone hadn’t noticed the Boeing name on a serial number tag, they’d have tossed it out and not given it another thought.
And that’s likely what happened to the recorders."