Dr. Euler's Fabulous Formula: Cures Many Mathematical Ills

http://tetrahedral.blogspot.com/2012/02/euler.html

http://math-frolic.blogspot.in/2012/03/dr-eulers-fabulous-formula.html

*Paul J. Nahin talks about His books

http://www.youtube.com/watch?v=7rrgRlP-kG8