NOVA investigates the story of cannabis from the criminalization that has disproportionately harmed communities of color to the latest medical understanding of the plant. What risks does cannabis pose to the developing brain? How much do we know about its potential medical benefits? As cannabis becomes socially accepted, scientists are exploring its long-term health consequences.

Outside the Sudanese capital Khartoum, the remains of an ancient city stand in the desert. Are you ready to dive beneath the pyramids of Sudan's black pharaohs?

A 17-year-old girl is murdered. The police have no clues, but a theory arises: she is one of the victims of a serial rapist and murderer. Unpublished interviews and footage bring a shocking revelation about his death.

Assassin John Brown, a heroin-addicted, recent war veteran, is hired to take out a local nightclub owner. When Brown slips, he finds himself on the run from both police and the shadowy corporation that hired him.

A young man finds a lemon on the sidewalk, takes it home, and becomes inordinately fond of it. Complications ensue.

A war veteran's vision of Jesus leads him to renounce everything he owns and form a fraternity of oddball eccentrics to join him in Gospel poverty. It's One Flew Over the Cuckoo's Nest meet an intelligent dose of Christianity...on the streets of Brooklyn.

Old friends reunite after their childhood anchor dies, forcing them to face buried dreams, tensions, and regrets while discovering their true selves and future possibilities.