The White House on Tuesday unveiled an updated national strategy on suicide prevention that includes more emphasis on health equity and diversity and the mental-health impact of social media. Second gentleman Doug Emhoff launched the new strategy at the White House, which he prefaced with words of comfort and encouragement. The U.S. remains in a small clique of about 40 mostly high-income nations that have national plans to combat a menace that has left no society unscarred.