We may receive a commission on purchases made from links. Depending on when you grew up, you might have owned (or wanted) a projector that lit up your bedroom ceiling with a starry night sky.

When cheap digital TV dongles enabled radio enthusiasts to set up software defined radio (SDR) systems at almost zero cost, it caused a revolution in the amateur radio world: now anyone could tune in ...

Depending on when you grew up, you might have owned (or wanted) a projector that lit up your bedroom ceiling with a starry night sky. Technology has evolved by leaps and bounds in recent years, and ...