During the spill, three shifts of employees monitoring the pipeline from the command center in Edmonton, Alberta, received multiple warning alarms, but dismissed them as being caused by column separation, or bubbles of vapor in the pipeline, according to the NTSB investigation.

CNN: STORY HIGHLIGHTS

Paul Volcker fires a warning shot against this risky approach in a New York Times column.

FORBES: With The Twist, The Federal Reserve Is Pushing On A String

He wrote his final "Abroad at Home" column for The Times on Dec. 15, 2001, warning against the U.S. fearfully surrendering its civil liberties in the wake of the terrorist attacks three months earlier.

WSJ: Pulitzer Prize-winner Anthony Lewis dies at 85