The HIV retrovirus, in particular, is a single-stranded RNA virus that duplicates itself in a host cell by converting its genetic code into double-stranded DNA that is then inserted into the host cell.

FORBES: Progress in Drug Therapy Marks the 25th Anniversary of World AIDS Day

The head of the British-based team, Dr. Miodrag Stojkovic, told The Associated Press that the double breakthrough proved that stem cell techniques could be successful in humans.

CNN: Cloning success hailed, feared

There are 6 billion chemical letters that make up the DNA double helix at the center of every cell.

FORBES: Companies, People, Ideas

The additional front-wheel drive called for a newly designed front axle: unlike the series production vehicle with AMG V8 engine, which has a double wishbone axle, the SLS AMG E-CELL features an independent multi-link suspension with pushrod damper struts.

ENGADGET: Visualized: Mercedes-Benz SLS AMG E-Cell bares all

According to the Sunday Telegraph, documents sent by MI6 to Libyan intelligence chief Moussa Koussa reveal a double agent was recruited to infiltrate an al-Qaeda terror cell.

BBC: Gaddafi