On a warm January afternoon in Boston's North End, a five-story steel tank burst and unleashed 2.3 million gallons of molasses that swept through the streets at 35 mph. It killed 21 people, flattened buildings, and left a mystery for physicists that took nearly a century to solve.
The full account: the Purity Distilling tank, the eyewitnesses who described the ground shaking, and the six-year lawsuit that followed. Start here for the whole strange arc.
A calm, meticulous 10-minute retelling that captures just how absurd and horrifying the disaster was for the people caught in it.
Live Science breaks down how a substance you associate with slow-dripping pancakes became a fast-moving killer capable of snapping trolley tracks.
A longer-form documentary walking through the engineering failures — the too-thin steel, the ignored leaks painted brown to hide them — that doomed the tank.
Molasses is a non-Newtonian fluid, and that's the key to the horror. Scientific American explains the fluid dynamics that let the wave both crush and then trap its victims.
How 2016 Harvard research finally modeled the disaster: cold January air quadrupled the molasses's viscosity, turning the settling flood into a hardening trap.
The legacy: locals still swear that on hot summer days, the North End smells faintly of molasses. A look at how Boston remembers its sweetest tragedy.