Around 1159 AD, Bhaskara The Learned sketched the earliest known design for a Perpetual Motion Machine. 

He probably had not been the first and he certainly wasn’t the last great mind to attempt to create a contraption that could do work indefinitely. 

Among the other failed attempts were those of Leonardo Da Vinci and our very own Robert Boyle.

So, why didn’t it work and who can we blame for our inability to create free energy? Jennifer Vail is a Tribologist with Dupont who joined Jonathan McCrea to explain everything about "tribology".