Inside Medellin: How Pablo Escobar's hometown hopes to become South America's 'Silicon V
• http://www.telegraph.co.uk, By Harriet AlexanderMedellin was once the world's most murderous city, famed for cocaine cartels and death squads. But now, writes Harriet Alexander, it is putting its business acumen to good use, and reinventing itself as a thriving tech hub