Crawling out from underground every 13 or 17 years, with a collective song as loud as jet engines, the periodical cicadas are nature's kings of the calendar.

GALLERY: 20 years of Punxsutawney Phil's Groundhogs Day celebrations

Tennessee and other southern states are expected to experience the effects of a rare dual emergence of two cicada broods at the same time.

The number of centenarians is expected to quadruple in the U.S. over the next 30 years, according to the Pew Research Center.

Fossilized human footprints found in New Mexico in White Sands National Park date back to between 21,000 and 23,000 years ago.

His passion for flying began long ago as he remembered being a paperboy during World War II.

Missing too much work often leads to termination. At least, for most people.That wasn't the case for Italian teacher Cinzia Paolina De Lio, who finally lost her