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So, what can a cardboard tube be used for other than holding wrapping paper?

Let’s make this simile about a strong uncle even more specific.

You won’t believe how this spelling and vocabulary puzzle will get kids’ brains sweating over the smallest of words.

Students infer the difference between transitive and intransitive verbs.

Imagine Tic-Tac-Toe if both players could play as both Xs and Os!

Every positive integer can be written as the sum of (at most) four perfect squares!