Welcome to the 23rd edition of the Mathematics and Multimedia Blog Carnival. This is a repost from Mathematical Palette, a blog which I no longer maintain.

In this edition, we have a miscellany of mathematics and mathematics teaching articles.

**John Cook** presents a proof technique that seems to give you something for nothing, an interesting Binomial coefficient trick, posted at the Endeavor.

**Shaun Klassen** has a clear explanation about the basic concept of limits in Using Limits to Find Tangents posted at Mathematics Concepts Explained. Continue reading