What is the criteria for genius?

What is a genius capable of achieving within the span of a human lifetime?

Was Nikola Tesla actually a genius that achieved all that he was purported to have achieved?

I'm going to leave you all the information I have on the man and let you decide.

"Electrical Genius - Nicola Tesla"
by Arthur J. Beckhard
Copyright 1959

This book is in my library courtesy of my grandmother, who used to be a librarian at an elementary school back in the 60s. Ostensibly...

Nikola Tesla