The study of the origin of dogs remains, in many ways, a puzzling field.

BBC: Dog evolved 'on the waste dump'

NASA's study of NEOs provides important clues to understanding the origin of our solar system.

ENGADGET: PSA: Asteroid 2012 DA14 will pass the Earth at 2:00pm ET Alt

The study found that the gap in life expectancy between black and white women of non-Hispanic origin closed to 3.7 years in 2008, down from 4.6 years in 2003.

MSN: Racial gap in life expectancy reaches new low in US