GPS is a technology that has been around for a while and has become incredibly integrated into our lives.  It is so ubiquitous but most people don't know how it works.  Some people think the system is dumbed down from Military systems but that's not entirely true and there are multiple systems out there.  The physics about GPS is very cool

How Dangerous is Alcohol?

A conversation between Mark and Jeff, two information junkies, about a wide range of contemporary issues. We discuss current events, nerdy things, business concepts, marketing, technology, media and photography.  As we are based in Edmonton, Alberta, Canada, there are lots of local topics. The podcast is generally upbeat and often covers current events and we occasionally have guests.  Each episode typically has a central focus for most of the podcast but also lots of other regular topics including what they learned in the last week and what media they are consuming.