NEW YORK The New Yorker magazine , a staple of American literary and cultural life defined by its distinctive covers, long-form journalism , witty cartoons and particular grammar, is celebrating 100 years on newsstands. To mark the publication's centenary milestone, four commemorative issues are being released, while its namesake city will host seven exhibitions ahead of a Netflix documentary on the title known for its artistic cover creations. Despite its storied history, the New Yorker often