Sylvester the Fly was caught in northern Philadelphia in May 2025.
This source code makes up a website hosted at https://www.seas.upenn.edu/~ericoc/fly/
The website showcases microscopic images that were taken of a fly, using the Quanta 600 FEG Environmental Scanning Electron Microscope (ESEM) at the Nanoscale Characterization Facility (NCF) at the Krishna P. Singh Center for Nanotechnology at the University of Pennsylvania.