Dr. Richard Feynman - Discovers the O-Ring Problem

During a televised segment of the Rogers Commission hearings (on the 11th of February, 1986), Dr. Richard Feynman pointed-out a likely reason why Challenger exploded.  Conducting a simple experiment, he revealed that the O-rings were made of a material which was not resilient in cold weather.

This is the actual footage when Dr. Feynman's questioning of Larry Mulloy helped the world to understand what doomed the STS 51-L mission.

Credits

Clip from the Rogers Commission hearing, featuring the questions of Dr. Richard Feynman.