This Day in Blogging History: Crowd psychology in Grand Central; Return to Physical Graffiti; 10K links on BB

One year ago today
The crowd psychology of Grand Central Station: The rapid reconfiguration of Grand Central had a lot to do with crowd control — figuring out how to use architecture to make the unruly masses a little more ruly.

Five years ago today
Physical Graffiti -- return to the scene: Artist Lou Cannizzaro went back to 96 St Marks Place in Manhattan 33 years after that location starred on the cover of Led Zeppelin's Physical Graffiti album.

Ten years ago today
10,000th link: This is the 10,000th link posted to Boing Boing. Whee!