2.0.0: Updated for Android 8.0. 1.5.1: Fixed Google Licensing for Android 5.0 (Lollipop). 1.5.0: Added question. 1.4.0: (1) Added question. (2) Updated text. 1.3.0: Added new book. 1.2.0: Update text. 1.1.2: (1) Improved tablet support, (2) Updated buttons. 1.1.1: Correct Google Play licensing. 1.1.0: Added 4 questions. 1.0.1: Correct Google Play licensing.