How Did Everything Around the World Show Up at Once?

Slider and I have been discussing how the Iron Age showed up around the globe at the same time.  Same with pyramids, the Stone Age and the Bronze Age.  Supposedly, there was no communication or trade routes around the world when these things occured.  So what happened?  This week on Conundrum with Cougar and Slider, we ponder these questions and take a few guesses of our own.  Join us this Thursday, March 26th at 5:00 PM Eastern, 4:00 PM Central and 9:00 PM UK to see what we come up with!