frictional resistance

Of all the frictional resistance, the one that most retards human movement is ignorance, what Buddha called "the greatest evil in the world." The friction which results from ignorance can be reduced only by the spread of knowledge and the unification of the heterogeneous elements of humanity. No effort could be better spent.
Science is but a perversion of itself unless it has as its ultimate goal the betterment of humanity.

Nikola Tesla