I just released the new 2020 edition of my 2017 book HACKING THE CORE –– Find Your Untapped Creativity and Innovation to Create a Successful Startup.
https://www.amazon.com/gp/product/B085HMZ78X/
The 2nd edition has a few additions, new photos, corrections etc. But more important –– it was reformatted specifically for Amazon Kindle platform. This edition is only available on Kindle for now, and price was reduced from $8.99 to $2.99.