Willingham insisted that, when he left the house, the fire was still around the top of the walls and not on the floor.

NEWYORKER: Trial by Fire

Hot enough to melt the church bells, the Palm Sunday fire peeled five centuries of whitewash off the walls, exposing enormous Gothic frescoes painted when the building was erected.

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Ashen Gill and her two sons were left with just three cob walls and half of a partition following a large fire at their home which was tackled by about 100 firefighters.

BBC: Crediton fire: Owner Ashen Gill rebuilds home

During the Lime Street experiment, other things happened that were supposed to occur only in a fire fuelled by liquid accelerant: charring along the base of the walls and doorways, and burning under furniture.

NEWYORKER: Trial by Fire

Lovingly nicknamed Anna Konda (no explanation necessary), the Norwegian bot was assembled using 20 hydraulic motors powered by a regular fire hose, whose 100 bars of pressure give it enough strength to break through walls and even lift a car right up off the ground.

ENGADGET: Anna Konda: the firefighting snakebot

When fire investigators examined the scene, they found the classic signs of arson: low burns along the walls and floors, pour patterns and puddle configurations, and a burn trailer running from the living room into the hallway.

NEWYORKER: Trial by Fire