How to study chess tactics on your phone - best combinations of 2016 collection

This is a screencast from my smartphone, illustrating how to solve chess puzzles in the Kindle app, reading through an ebook  https://www.amazon.com/Modern-Chess-Combinations-November-Quarterly/dp/1520868243 that contains over 140 best combinations played by strong chess players in tournaments that took place in the fourth quarter of 2016. The highlights/arrows in the video are a bit clumsy, but they are obviously only there because there is now other way to point at things when making a video on the phone.