FILE 01
Engineering & technology /Evidence & reasoning
The bridge that fed its own motion
Tacoma Narrows, 1940: follow the energy, not just the wind
The investigation archive
Every event has
a chain of causes.
Choose a case. Open the evidence. Decide what it can actually tell you.
24 investigations
FILE 02
Engineering & technology /Evidence & reasoning
The number with the missing meaning
Mars Climate Orbiter, 1999: an interface failure across Earth
FILE 03
Engineering & technology /Evidence & reasoning
Two computers, one assumption
Ariane 501, 1996: when backup is not independence
FILE 04
Engineering & technology /Evidence & reasoning
A perfect result from a wrong ruler
Hubble, 1990: precision without independent accuracy
FILE 05
Engineering & technology /Evidence & reasoning
The detail that carried two walkways
Kansas City, 1981: trace where the weight goes
FILE 06
Engineering & technology /Evidence & reasoning
The failure that began before launch
Apollo 13, 1970: reconstruct a component’s hidden history
FILE 07
Engineering & technology /Evidence & reasoning
The grid that lost its warning signs
Northeast blackout, 2003: local faults, regional consequences
FILE 08
Engineering & technology /Evidence & reasoning
When previous survival becomes false reassurance
Columbia, 2003: distinguish missing evidence from evidence of safety
FILE 09
Science & Discovery /Evidence & reasoning
The Missing Pull
An orbit is wrong. Is the law wrong—or the inventory?
FILE 10
Science & Discovery /Evidence & reasoning
The Noise That Filled the Sky
An antenna’s unwanted signal becomes a cosmological clue.
FILE 11
Science & Discovery /Evidence & reasoning
The Clock in the Scruff
A recurring mark on a chart challenges the interference explanation.
FILE 12
Science & Discovery /Evidence & reasoning
The Antarctic Spring Gap
A long-running measurement changes when nobody expects it to.
FILE 13
Science & Discovery /Evidence & reasoning
The Ocean-Floor Tape
Symmetric magnetic stripes test an idea about moving continents.
FILE 14
Science & Discovery /Evidence & reasoning
The Boundary and the Crater
A chemical anomaly needs a source, a date, and a mechanism.
FILE 15
Science & Discovery /Evidence & reasoning
The Clear Zone
An antibacterial observation is not yet a usable medicine.
FILE 16
Science & Discovery /Evidence & reasoning
The Chirp in Two Places
A fleeting signal must survive an extraordinary noise investigation.
FILE 17
Systems & finance /Evidence & reasoning
Trading faster, buying less
May 6, 2010: volume is not market depth
FILE 18
Engineering & technology /Evidence & reasoning
The eighth server
Knight Capital, 2012: a release that was not everywhere
FILE 19
Environment & history /Evidence & reasoning
The city under a lid
London, 1952: emissions meet an atmospheric trap
FILE 20
History & discovery /Evidence & reasoning
The exception beside the pump
Soho, 1854: test the pattern against the people it misses
FILE 21
History & technology /Evidence & reasoning
A guess that rules things out
Bletchley Park: the machinery behind a testable crib
FILE 22
History & exploration /Evidence & reasoning
When the destination stops mattering
Endurance, 1915–1916: revise the mission as the evidence changes
FILE 23
Science & technology /Evidence & reasoning
The clock that is right in the wrong place
GPS: a design investigation, not a historical outage
FILE 24
History & technology /Evidence & reasoning
A photograph without film
Kodak, 1975: distinguish a working principle from a finished product
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