The report gives a list of eight "Black Swan" scenarios -- a reference to Nassim Nicholas Taleb's book "Black Swan, " which posits that history is built on unforeseeable, surprise events.

CNN: STORY HIGHLIGHTS

The pictures come from the Visible Infrared Imaging Radiometer Suite (VIIRS) satellite, and have been referred to as "The Black Marble" in reference to the famous "Blue Marble" daylight pictures.

ENGADGET: Alt-week 12.08.12: The oldest known dinosaur, lighting up a space station and the black marble

While other Olympians go by heroic-sounding nicknames like "bullet" or "torpedo, " Abdirahman calls himself the "Black Cactus, " a reference to his race and to the Arizona landscape in which he trains.

WSJ: Abdi Abdirahman Goes for Gold or Whatever in the London Games

But the first reference to the different meanings of white or black smoke occurred at the 1903 conclave.

CNN: March 13, 2013 -- Updated 0018 GMT (0818 HKT)

During his recent speech before the civil rights group, the NAACP, he made reference to these events to emphasise his theme of black self-improvement.

BBC: Racial politics in the White House

These "known unknowns" he dubbed "grey swans", in a reference to Nicholas Nassim Taleb's book "The Black Swan", about the nature of unpredictability.

BBC: WPP Martin Sorrell says tax 'a question of judgement'

Wearing a black suit with a red tie and frameless glasses, Chavez made reference of his newly shaven head.

FORBES: Venezuela's Hugo Chavez Shaves His Head Because Of Chemotherapy

An article Friday about Ms. Black's controversial appointment as chancellor incorrectly referred to her as Ms. Hearst in one reference.

WSJ: Corrections & Amplifications