What is CosmicWatch? How a $100 detector can spot invisible particles 'muons' raining down from space

With a price tag of approximately one hundred dollars, CosmicWatch is a cost-effective handheld muon detector. This device identifies the unseen muons created as cosmic rays interact with our planet's atmosphere. Originally designed as a hands-on physics project for students, CosmicWatch has transitioned into a significant tool for research and balloon-based investigations, allowing students and researchers alike to explore the mysteries of universal physics.