In this list, we've gathered up some of our favorite puzzle brands that we believe are worth dropping money on and noted some ...

Specifically, the AI was able to make progress on a complex problem called the Andrews–Curtis conjecture, which has stumped ...

Alongside the letters, Engelstein found an original, complete set of rules for GHQ: General Headquarters, Vonnegut's simple ...

An old calculator uses a seven-segment display, in which numerals are represented by different patterns of vertical and horizontal line segments. But the device is faulty and no longer shows any ...