Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that ...

In this lesson, students analyse a counting-out game, known as the Josephus problem, in which people are excluded one at a time until the person left at the end is the winner. Students explore which ...

Counting is important if you count the right things. My friend Derric Johnson reminds us that today’s culture keeps us counting money, counting pounds, counting calories, and counting steps. We need ...