This Way Up for Saturday 4 February 2012 This Way Up

Clean tech boom and bust

Juliet Eilperin of the Washington Post has been watching a cycle of boom and bust in the US renewable energy sector.

Tech news: Facebook float

Tech correspondent Peter Griffin goes inside the numbers of Facebook's planned flotation.

Pop-up gardens

We go urban gardening with pop-up gardener Amanda Yates from Massey University.

Birds: Black-backed gull

We chase the black-backed gull with Hugh Robertson.

Does a Strad sound better?

Claudia Fritz studies instrument acoustics and is testing if antique violins (think Stradivarius and Guarneri) really sound any better than modern instruments.

Guerilla grafting

Tara Hui is a guerilla grafter who's returning ornamental fruit trees to production one branch at a time!