We have been able to travel at supersonic speeds for decades, the technology is well know as are the consequences of going very fast.  There used to be Concordes but nothing after them.  What happened, why don't we do air travel at supersonic speeds (at the moment) and why almost all commercial airplane travel is in a sweet spot of about 0.85 Mach (speed of sound) at an elevation of 35,000 - 45,000 feet.

Photographic Competitions - Why They Help Improve Your Images

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.