Puzzle Planet.

A new book needs you.

Of trashcans and thimbles.

That can't be the answer. (Can it?)

The Puzzle of the Prankster Twins

Logical riddles about a real-life pair of brothers. No hockey knowledge required.

Data Science Contest: Which U.S. Cities are the True Twins?

The three criteria for twin cities: over 100,000 people each, at most 10 miles apart, and populations within a factor of two.

Prize: a signed book.

The Anti-Calculator Puzzle

A cute little math problem (that grows into a monster).