This app keeps tracks of number of days pastfor your events. Use this to remind yourself how many days has pastsince your last oil change, clean up, had fast food, etc.

This app lets you plot functions f(x). Graphlines, parabolas, trig functions and more.

This app allows you to draw with your fingers.You can also draw straight lines, ovals and rectangles, and useadditional effects such as blur and emboss. You may save your fileand reload to edit later, and send to your friends.

This app lets you experiment with mathematicsthrough 23 little demonstrations. See the number line in action.Select two points on a line to get the equation. Set your ownparameters to see parabola, sine waves, and more.This app is a supplement to my book: Math Journey. Available onlulu: http://www.lulu.com/shop/joseph-mak/math-journey/paperback/product-3184664.html

Use this app to read the full text oftheChinese military classic, the Art of War by Sun Tzu, intraditionalChinese, simplified Chinese, or English.

This app quizzes the 4 basic math operationsand provides explanations in number line demonstration as well asthe pencil-and-paper method.Level 1: one digit, level 2: 1 or 2 digits, level 3 withintegers

Psalms in Classical Chinese or modernChinese

Use this app to build your vocabulary.