Just read around. There are multiple angles you can come from, all pointing to the same thing.
There were military wargames pre-scheduled for that day, and the days immediately preceding and following it, that included simulations of hijackings
and inserting lots of false blips on radar screens. There are infamous transmissions like "Is this real world or exercise?" resulting from this,
demonstrating that the air response was confused by this "coincidence."
FEMA was also setting up around WTC7 on the day before 9/11, 9/10, and Rudy Giuliani stated as much to the 9/11 Commission though they excluded it
from their final report. They were preparing for another pre-scheduled exercise, this time "TRIPOD II" which was to simulate a bio-terror exercise
in Manhattan. When things started happening on 9/11, they already had a base of command set up where federal officials directed the NYPD and FDNY
and other emergency services that day.
Show this person/these people videos of WTC7 falling if they've never seen it. Tell them a 3rd skyscraper about half the height of the towers but
still a massive building for any city, 47 stories tall, dropped from its roof line into its footprint in about 8 seconds, accelerating at the rate of
gravity. If they really understand any mechanics or energy at all then they will instantly understand what that means. This simple, lone fact is why
myself and many others are posting here today. It will always speak to reason beyond the heaping mounds of bull crud that "debunkers" mount in
defense.
There are so many "odd," "coincidental," "controversial" things about 9/11 it's hard to remember everything that's good to know. Of course
there were numerous explosions occurring all morning in all 3 of the WTC skyscrapers, both of the towers and WTC7. These explosions have never been
explained. They're hand-waved off by every "debunker" who will automatically assume they were caused by anything, except explosives or bombs.
The evidence they base this immediate exclusion on, doesn't exist. It's a feature of their being impossibly opinionated, and most of them seem to
have no interest in
finding out what was causing all of the explosions either. Also FDNY, NYPD, some FBI officials, civilians, etc. testified
to both
explosions and explosives/bombs in the building, based on either experiencing an explosion first hand or hearing from someone else on
the scene who had.
Many people described an explosion in the basements that either coincided with, or slightly preceded, the plane impacts in WTC1 and to a lesser extent
in WTC2. The alleged seismic signal from the "first impact" has been analyzed from multiple sources (for example by ME Gordon Ross and Craig
Furlong) and it has been found that the first seismic signal could not have originated from the first plane impact because the times do not match up,
and are off by as much as 1/4 of a minute or more. These are sources that are supposed to agree with each other and be synced with the atomic clock
that NIST itself maintains. You can look up the two names I mentioned above for all the details on this.
According to officials none of the 4 black boxes (2 per plane) at the WTC site were ever found, even though at least individuals associated with the
clean-up and recovery state they saw one of the boxes being recovered and delivered to officials first-hand.
They had video cameras all over the Pentagon and surrounding buildings facing toward the Pentagon, but only released a couple still frames that show
nothing.
Like I said, there's so much that I could sit here all day thinking of tidbits like this....
Here are some other places to visit:
Free 9/11 Researcher Starter Pack
20 9/11 Questions Remain Unanswered over 8 Years Later
whatreallyhappened.com...