Did we mention that library stacks still exist? Not all information has migrated online.
Stacks, however, are tall and can be wobbly.
Books, especially piles of them, can weigh a ton. Mix stacks and piles of books, and one not-too-in-shape librarian, and you get a recipe for:
Slip and fall
Fall and slip
Head injuries (ever had an entire top row of Fannie Farmer cookbooks fall right on top of you, smashing first into your head?)
Even sedentary librarians don't escape the strain of the physical world. Tap, tap, tap on computer keys means ouch ouch ouch for librarians who develop a case of repetitive stress injury. Eye strain from staring fixedly at the computer screen is also an occupational hazard.
And watch out for those chairs. The wrong chair today, the aching, twisted back tomorrow.
But to be honest, there is always the possibility that some unsavory character will enter the facility (kinda tough for public libraries to turn anyone away) and then corner and assault you behind one of those tall bookshelves. Or they just might lash out when told they can't take a bath in the restroom. So if there are no safety officers on hand...keep a couple eyes in the back of your head.