Mullan said there are about 23,000 light fixtures in the tunnels, and corrosion has been found in fewer than two percent. He said there’s no danger to the public.”
Right. It’s not like a ceiling is gonna fall on someone. Nothing to see here. Move along. Wait a minute. 2% of 23,000 light fixtures ... 460 fixtures that could fall? Sorry, but that sounds bad, doesn’t it? And why didn’t he just say there were 450 or so fixtures? Sound like too much? 2% sounds like less? Only the kids from Groton School would figure it out?
http://en.wikipedia.org/wiki/Big_Dig_ceiling_collapse
The ceiling has fallen previously.