When I was an undergraduate, I sent the following letter to the author Paul J. Nahin in which I critiqued and explained what I liked about his two books An Imaginary Tale: The Story of  and its sequel Dr. Euler’s Fabulous Formula: Cures Many Mathematical Ills. I also ended up using it for my final project in the second-year honors calculus class here at UW. I highly recommend these two books, especially for young people (as in those who recently learned about Taylor series)! To view in a separate tab, click here!