The man's teeth and groovy brown '70s turtlenecks were an integral part of my childhood watching PBS.
I think there may have even been a scientific paper on the topology of his sweater--or was it on the filament/ gravity lens potential of Asimov's sideburns...I forget.
There are FIVE pocket protectors!
Ted Knight voice on...
Nerd of the week #2, from the League of Super-Hero rejects:
BRAIN-O! The Worlds Smartest Moron
The square of the hypotenussse is the sum of the other two....uhh...George Washington.
Still, Carl's attire aside public television had some pretty cheesy graphics and editing back then, even the best and greatest of programming. 

