See how you do in this wonderful game of skill and logic. Try to move all the disks onto another pole. Thing is, you can only move one disk at a time and you must follow size order (a bigger disk can't go on a smaller disk). Good luck!

Can't remember the formulas for the other two parts of a circle (area, diameter, or circumference) when you only know one? To the rescue is Circle Solver. Enter the circle area, diameter, or circumference and it will solve for the other two! Great!

Just enter a math expression (with +, -, *, and / signs) and this script will evaluate the expression for you. Who needs a calculator when you have JavaScript.

This script solves algebraic equations with complex coefficients up to the cubic order. Enter a numerical value; click on a coefficient-button to assign the value. Then click the "Solve" button.