Fact or Fiction
Fact or Fiction
Ask any question, including odd ones. You get a percentage, a clear call of more or less than 50%, the working, and the sources that produced it. If nothing matches, the score stays at 50% — nothing is invented.
Likelihood
H005 WTC7 collapse resulted from fire-induced structural failure
52%
Equal to 50% — the sources do not tip either way
The score is 52% — more than 50%. Supporting sources currently outweigh contradicting sources after quality and confidence are applied.
How 52% was calculated
Start at 50%. Move by half of the net source score after uncertainty. Net source score is 0.24 (from −1 contradict to +1 support). Uncertainty is 83%. So 50% + 50% × 0.24 × 17% remaining certainty = 52%.
Supporting sources
4
Weighted strength 1.38
Contradicting sources
5
Weighted strength 0.85
No stance yet
32
Pulls the score toward 50% · 10.44
Uncertainty
83%
Share of the file that is unlabelled or missing
Working
start at 50% + half of (net source score × remaining certainty)
0.5 + 0.5 × 0.24 × (1 − 0.83) = 0.520
This percentage is calculated from the sources listed below — it is a score, not a court finding. Official origin does not add extra weight. Independent origin does not subtract weight. Two papers from the same group are one cluster, not two independent confirmations.
Reasoning
Step 1 · Match the question
Closest stored question: H005 — WTC7 collapse resulted from fire-induced structural failure. Yes/no labels are taken from sources already linked to that question. Also close: H006, H011, H021.
Step 2 · Find matching sources
40 source(s) matched the wording. 10 further source(s) already linked to the stored question were included even if they did not contain the search words. 3 matching claim(s) contributed inherited stances.
Step 3 · Assign support or contradiction without inventing
10 labelled from stored question links, 1 from claims, 0 labelled automatically (capped, marked, not saved as human review), 30 left with no stance.
Step 4 · Weight each source
Each source contributes strength = (quality / 5) × confidence × how strongly it agrees or disagrees. Support strength 1.38, contradict strength 0.85, no-stance strength 10.44. A zero on chain of custody still lowers the mean and stays visible.
Step 5 · Turn that into a percentage
Start at 50%. Move up if support outweighs contradiction, down if the reverse. Unlabelled sources shrink the movement, so a thin file stays near 50%. Working: 0.5 + 0.5 × 0.24 × (1 − 0.83) = 0.520.
Step 6 · What this number is not
This percentage is calculated from the sources listed below — it is a score, not a court finding. Official origin does not add extra weight. Independent origin does not subtract weight. Two papers from the same group are one cluster, not two independent confirmations.
What is still missing
- 4 source(s) score zero on at least one quality check (shown on each card). Those zeros are kept visible and are not averaged away.
- 7 source(s) are unverified, inactive, or recorded as not retrieved. A missing file is a gap, not a finding against the question.
- 32 relevant source(s) have no stance yet. They increase uncertainty and pull the percentage toward 50%; they are not counted as support or contradiction.
- A second stored question (H006) also matches this wording. The percentage below is for H005 only — open the other question to compare. Do not average the two numbers.
Closest stored question
H005 · WTC7 collapse resulted from fire-induced structural failureengineering · match 43.6
Related questions
Same wording can map to more than one stored question. Each has its own percentage — do not average them.
Matching claims
- disputedCLM-015
WTC 7 collapsed from ordinary office fires following debris impact, without explosives.
- disputedCLM-016
Explosives or other additional energetic mechanisms contributed to WTC 7's failure.
- disputedCLM-030
WTC 7's entire measurable north and west rooflines instantaneously transitioned to free fall, a behaviour NIST's Stage 1 description conceals.
Sources that support this
4NIST NCSTAR 1A: WTC 7 collapse initiated by fire-induced buckling of Column 79
NIST NCSTAR 1A — Final Report on the Collapse of World Trade Center Building 7 (2008) · 2008-11-20
NIST attributes WTC 7's collapse to fire-induced failure beginning at Column 79, with global collapse at 17:20.
hypothesis link · human_seed link to H005 (seeded): NIST Column 79 fire-induced sequence.
FEMA 2002: WTC 7 fire-induced progressive collapse; further study needed
FEMA 403 — World Trade Center Building Performance Study (2002) · 2002-05-01
An early official engineering team attributed WTC 7 to fire while flagging that the mechanism was not fully understood.
hypothesis link · human_seed link to H005 (seeded): FEMA 2002 fire-induced working hypothesis.
NIST: no corroborating evidence for explosives or thermite
NIST WTC investigation FAQs (towers and WTC 7) · 2019-11-20
NIST published a negative finding on explosives and thermite as collapse causes.
hypothesis link · human_seed link to H005 (seeded): NIST negative on explosives for WTC 7 as well as the towers.
Harrit et al. 2009: active thermitic red/gray chips in WTC dust
Harrit, Farrer, Jones, Ryan et al., The Open Chemical Physics Journal 2:7–31 (2009) · 2009-04-03
A 2009 peer-reviewed paper reports energetic red/gray chips in WTC dust that the authors identify as unreacted thermitic material.
claim stance · Inherited from matching claim CLM-016.
Sources that contradict this
5Hulsey et al. (UAF): fire did not cause the observed collapse of WTC 7
Hulsey, Quan, Xiao — University of Alaska Fairbanks WTC 7 study (2019–2020) · 2020-03-01
A University of Alaska Fairbanks team published a model concluding fire did not cause WTC 7's observed collapse.
hypothesis link · human_seed link to H005 (seeded): Hulsey: fire did not produce the observed collapse.
Chandler, Walter, Szamboti — Instantaneous free fall of WTC 7 and NIST's attempt to hide it (Jun 2023)
Journal of 9/11 Studies · 2023-06-01
Using multi-point tracking, Chandler/Walter/Szamboti report that after ~1.4 s of near-immobility of most of the north and west rooflines, those rooflines entered free fall together within ~0.2 s at ~8.0–8.2 s after east-penthouse collapse, ~9.8 m/s² for ~2.5 s.
hypothesis link · human_seed link to H005 (seeded): Authors say the motion is inconsistent with NIST global-collapse analyses.
AE911Truth petition: thousands of architecture and engineering signatories dissent from NIST
Architects & Engineers for 9/11 Truth (Richard Gage and associated filings) · 2019-01-01
A public petition of architects and engineers calls the official collapse explanations incomplete and asks for a new investigation.
hypothesis link · human_seed link to H005 (seeded): Same petition is organised opposition to fire-only.
Kevin R. Ryan — Why the NIST World Trade Center Reports are False (Toronto Report ch.3)
The 9/11 Toronto Report (2012), International Hearings on the Events of September 11, 2001 · 2012-09-11
Ryan cites NIST test and model figures (steel temperatures, sag, expansion, fire duration) and states they do not support the published collapse sequences; he notes NIST did not release its global models for independent runs.
hypothesis link · human_seed link to H005 (seeded): Ryan: WTC 7 girder walk-off arithmetic and unreleased models.
David Chandler — WTC 7: A refutation of NIST's analysis (Toronto Report ch.9)
The 9/11 Toronto Report (2012), International Hearings on the Events of September 11, 2001 · 2012-09-11
Chandler's 2012 hearing paper treats NIST's own Stage 2 free-fall interval as established and argues the 5.4 s overall figure is an artefact of start-time choice.
hypothesis link · human_seed link to H005 (seeded): Same paper as a NIST-refutation.
Sources with no stance yet
329/11 Commission did not investigate WTC 7's collapse mechanism
9/11 Commission Report · 2004-07-22
The 9/11 Commission did not produce a collapse-mechanism finding for WTC 7.
hypothesis link · human_seed link to H005 (seeded): Commission silence on WTC7 mechanism is a scope gap, not a NIST finding.
NIST FAQ: WTC 7 north face had a 2.25-second free-fall stage
NIST WTC investigation FAQs (towers and WTC 7) · 2019-11-20
NIST measured a 2.25-second free-fall stage of WTC 7's north face and described negligible support from the structure below.
hypothesis link · human_seed link to H005 (seeded): NIST free-fall stage is compatible with its buckling model and with demolition arguments.
Rapid recycling of WTC steel before a full forensic metallurgical programme
FEMA 403 — World Trade Center Building Performance Study (2002) · 2002-05-01
Most WTC structural steel was recycled before a full federal engineering investigation existed.
unclassified · Retrieved as relevant; no inherited polarity. Unclassified mass raises uncertainty rather than inventing support or contradiction.
NIST: tower collapse times ~11 s (WTC1) and ~9 s (WTC2); minimal resistance below
NIST WTC investigation FAQs (towers and WTC 7) · 2011-09-14
NIST published collapse elapsed times near free-fall order and described minimal resistance below the initiation zone.
unclassified · Retrieved as relevant; no inherited polarity. Unclassified mass raises uncertainty rather than inventing support or contradiction.
Sonic Memorial: Eva Garfield Greenwich Village voicemails, 11 September
September 11 Digital Archive (RRCHNM / ASHP) · 2001-09-11
The Sonic Memorial collection includes saved 11 September voicemails in which Eva Garfield, from Greenwich Street, says she watched the towers fall, plus other WTC-building memory recordings.
unclassified · Retrieved as relevant; no inherited polarity. Unclassified mass raises uncertainty rather than inventing support or contradiction.
FDNY Incident Action Plans collection (Ground Zero, Sep 2001–2002)
September 11 Digital Archive (RRCHNM / ASHP) · 2001-09-21
FDNY published daily Incident Action Plans for Ground Zero rescue and recovery from at least 21 September 2001 through early 2002, covering hazards, void searches, and DDC work in the pit. A 911DA collection hosts them.
unclassified · Retrieved as relevant; no inherited polarity. Unclassified mass raises uncertainty rather than inventing support or contradiction.
Larry Silverstein, PBS 2002: 'maybe the smartest thing to do is pull it'
PBS — America Rebuilds: A Day with Larry Silverstein (2002) · 2002-09-10
The leaseholder said on camera that he suggested they 'pull it' regarding WTC 7 and that a decision to pull preceded the collapse they watched.
unclassified · Retrieved as relevant; no inherited polarity. Unclassified mass raises uncertainty rather than inventing support or contradiction.
Molten metal in the WTC rubble: FDNY/photographs vs NIST aluminium explanation
Harrit, Farrer, Jones, Ryan et al., The Open Chemical Physics Journal 2:7–31 (2009) · 2009-04-03
Witnesses and photographs show molten metal in the WTC debris pile well after 11 September.
unclassified · Retrieved as relevant; no inherited polarity. Unclassified mass raises uncertainty rather than inventing support or contradiction.
Topics
Day-of events, engineering questions, process failures, and foreknowledge leads.