Maybe a spider set off the motion cameras in an empty Glen Burnie library.
Maybe the books retained moisture and expanded, pushing them to the floor.
That's what a skeptic — or a well-researched librarian — would tell you, at least.
But Maryland Ghost Trackers revealed evidence Tuesday from a recent five-hour investigation in which they said several spirits were recorded at the Glen Burnie Regional Library.
Librarians at the Glen Burnie Library said they've been hearing noises that they just couldn't explain.
So what did they do?
They called the Maryland Ghost Trackers. It's a group that seeks to explain supernatural occurrences in our realm. Maryland Ghost Trackers co-founder, Laura Muscolino said she started ghost tracking to help people like the library.
Before a "Music and Movement" program got started Crofton dad Andre Barnes' two sons were already running laps in the open media room of the Crofton library.
Maryland Comptroller Peter Franchot told a handful of young moms holding their toddlers and children to start saving for college during a brief visit to the Annapolis Regional Library last week.
The 7-inch, touch-screen tablets, which use the Android operating system, come preloaded with 10 STEM, language, art and music apps. They are void of Wi-Fi and camera capabilities to ensure a controlled experience.