The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a proposed low-cost. largearea. next-generation experiment for the detection of ultrahigh-energy cosmic rays (UHECRs) via the atmospheric fluorescence technique. Two FAST telescopes are currently installed and operating at the Black Rock Mesa site of the Telescope Array Experiment in Utah. https://littlewhimsyes.shop/product-category/grown-ups/