PBS NOVA ScienceNOW S04E01, hosted by Neil DeGrasse Tyson.

Diamond Factory:
Visit a laboratory where entrepreneurs are growing perfectly pure diamonds.

Anthrax Investigation:
The new science of microbial forensics reveals the source of the anthrax used in the deadly attacks of 2001.

Auto-Tune:
Can't carry a tune? Andy Hildebrand's pitch-correction software can help you sing like a star.

Profile: Luis von Ahn
A computer scientist finds novel ways to stop spammers and harness the brainpower of millions of people.