Anyway, the concept of most of the show was the discussion of the end of those fascinating beasts, the dinosaurs, and what happened 66 million years ago. The theory that Jab Abumrad and Robert Krulwich discuss posits specifically that the dinosaurs met a fiery end between June and July of something like 66.2 million years ago — or was it 66.9? I can't remember specifically but I will continue to try to look it up. The reasons for the specificity can be traced to the pollen that was etched into the geologic record for that time and what the K/T boundary tells scientists. According to the theory, the Yucatan asteroid that crashed into Earth at this time spewed forth (into space even) particles that fell back onto the planet as glass and burned en masse as they re-entered the atmosphere, basically creating a mega-oven that burned up all life aboveground within 2 hours.
From what I've been able to further read about this, it is one of several theories, which include the earth-encompassing dust-cloud that surrounded the earth following the impact, which would've killed off plants, its herbivore dino-dependents, and the carnivorous dinos dependent on the vegetarians. The dino extinction wasn't of course the first (or last) mass extinction we've experienced — we're in the midst of one now — but this was a theory I hadn't heard before and found fascinating. In fact, I've found it hard to find reading material on it, but will keep looking.
Regardless, an awesome presentation on the "end of all things" dinosaur by the RadioLab folks. Hopefully some portion of it will make it on the air, and when it does, I'll post it asap.