This as-told-to essay is based on a conversation with Felicia Tang, chief of staff at startup Exa. It has been edited for length and clarity. San Francisco is a super competitive job market, ...

Daily puzzlers would be quick to tell you that sudoku, Wordle’s mathematical cousin, is not as easy as it looks. The small grid, found often next to a word scramble or comic strip in a print newspaper ...

An elementary-school math teacher silently paces his classroom in a pin-striped stockbroker shirt, his mouth full of braces. All around him, tiny students with pencils in hand struggle over puzzles at ...