Disenfranchised youth are offered the opportunity to turn their life around in exchange for 10 days of back-breaking labour.

Canada is fast becoming one of the hottest centres in the world for diamonds and the race is on to find the gems hidden under a barren and inhospitable land.

The recruits complete their training with fire drills. A series of manhole explosions rock Boston. And Smokey the Cat goes missing...

Witness four major restoration projects - a railway station, a cathedral, a museum and a bridge - and learn about the unique challenges each presents.

Bill Nye tackles the kitchen's biggest eco-mysteries, from paper vs. plastic to the environmental impact of non-stick pans.