6 PM ET: Poll finds Democrats pessimistic, a drinking water discovery, new McValue menu & more

Political shifts are afoot as President-elect Trump eyes his Agriculture Secretary. Meanwhile, a Pew Research poll reveals a gloomy outlook among Democrats. Scientists have cracked a drinking-water mystery, promising safer hydration. McDonald's teases a new McValue menu for next year. And, an inspiring story emerges as a 17-year-old Afghan girl earns the International Children's Peace Prize for her advocacy in education.