Tucson residents are being asked to check video footage along a seven-mile stretch of the Arizona city for suspicious ...

Neighbors have been asked to dig through dashcams for evidence of suspicious activity as the search for Nancy Guthrie enters its sixth week.

After false starts and incremental gains, scientists crack the problem that made breathing impossible. Will answers come fast enough to save the sick?

Scientists traced Leonardo da Vinci’s Y chromosome through living relatives, a breakthrough that may confirm his true burial ...

Sunday marks the 43rd day in the search for Nancy Guthrie, the 84-year-old mother of NBC "Today" show host Savannah Guthrie, ...