iOS 5 introduced a centralized Notification Center to handle all of iOS’s little alerts—”Bleep! You have a new tweet!” “Blurp! Time to play Words with Friends!” “Blort! Remember to pick up the dry cleaning!” Notification Center’s introduction in 2011 was a long time coming, and a welcome improvement to iOS’s previous modal-only pop-up alerts. Despite Notification Center’s long gestation, however, it lacked what many consider a critical feature—”do not disturb.” Read the full story at ARS Technica.