Optical illusions are brain-teasing visual puzzles that improve focus and observation skills. Can you spot the hidden number ...

The Texas power grid, 90 percent of which is managed by the Electric Reliability Council of Texas (ERCOT), is unique in the ...

1, 2, 3, and imagine highlighting the whole row marked three. Where the letter column and number row meet, is square C3, which is where you’re standing. That’s called a grid reference.

One of the notes is a Polybius Square Diagram showing nine numbers in a grid with six letters. The other note is a poem in Italian that has eight of the letters circled in red. The Mystery in your ...