Richard Feynman

Richard Feynman appears in the account as a physicist who made the Challenger disaster’s hidden mechanical cause tangible. At a congressional hearing, he dropped an O-ring into a glass of ice water; when he removed it, the seal had become brittle from the cold. The demonstration illustrated how the booster seals could lose resilience, leave gaps, and allow hot exhaust gases to escape—a failure that contributed to the shuttle’s destruction.

Demonstrating the Failure

Six months after the explosion, the Presidential Commission on the Challenger revealed that the O-ring seals on booster rockets made by Morton Thiokol were supposed to prevent hot exhaust gases from escaping, but became less resilient in cold weather. Feynman’s ice-water demonstration offered a compact physical illustration of that vulnerability: cold made the rubber brittle, helping explain how gaps could form in the seals.

Role in the Account

The book invokes Feynman not as a participant in the market’s rapid identification of Morton Thiokol, but as a later explainer of the engineering failure. His demonstration connects the eventual technical finding to the consequences described in the investigation: escaping hot gases burned into the main fuel tank and caused the catastrophic explosion. The brief scene gives an otherwise technical account a visible object and a simple test, clarifying why the seals failed without implying that the demonstration itself established the market’s earlier judgment.