Uh number one, the Challenger launch decision. Um so, this is a book about why the Challenger exploded, and it's by Diane Vaughan, who's a social scientist. And I thought I knew the story of why the Challenger blew up. I thought what happened was middle managers cut corners, and there was this rubbery O-ring that got brittle in the morning cold, and it snapped. And the idea was these people were foolish.
It says how long ago something was said, so you can tell last month
from 2014 without doing the arithmetic. Full and green is recent; it
drains and cools as the date gets older, and empties completely at about
6 years.
6d5 days ago
8mo8 months ago
2yr2 years ago
4yr4 years ago
9yr9 years ago
A striped bar means the date itself is an estimate — the source did
not carry an exact one. An entry with no date at all gets no bar.