Whoa.

I haven't seen Parisians do anything with as much dispatch and cohesion as they just evacuated the school during a fire alarm.

Perhaps relatedly, two hours ago, I somewhat inadvertently opened this window in the library and have been unable to close it.

On further inspection, we see that the locking mechanism is magnetically driven. So it is not entirely clear to me how I was able to open it in the first place. Merde.

Oh, well, it's really stuffy in here.