Introduction: How I picked up an AE-1 Program for 4,500 yen on Mercari and sold it for $210 Last month, I picked up a listing on Mercari for 4,500 yen titled "Canon AE-1 Program, sold as junk, ...

Abstract: Several essential services, such as cellular phones, the Internet, television, navigation, weather prediction, and remote sensing, rely on satellites in low-Earth orbits, the technology for ...