The Challenger Was Brought Down By An O-Ring . . .

Other things you don’t want to know include that six-ton piece of steel is held up there by a $50 piece of nylon webbing:

A prime suspect in Saturday’s East Side crane collapse — a spectacular disaster across two Manhattan blocks that has now claimed seven lives and is expected to cost untold millions — is a $50 piece of nylon webbing that investigators suspect may have broken while hoisting a six-ton piece of steel.

A photograph taken at the site shows the yellow nylon sling ragged at the end like a child’s broken shoelace, indicating, according to experts, the immense force that may have torn it apart.

The investigation into the accident continued on Monday as workers recovered three more bodies from the rubble of a four-story town house on East 50th Street that was demolished when a section of the toppling crane slammed into it. That brought the death toll from the collapse to seven, making it one of the deadliest construction accidents in New York City in recent memory.