This Way Up for Saturday 4 February 2012
Juliet Eilperin of the Washington Post has been watching a cycle of boom and bust in the US renewable energy sector.
Tech correspondent Peter Griffin goes inside the numbers of Facebook's planned flotation.
We go urban gardening with pop-up gardener Amanda Yates from Massey University.
We chase the black-backed gull with Hugh Robertson.
Claudia Fritz studies instrument acoustics and is testing if antique violins (think Stradivarius and Guarneri) really sound any better than modern instruments.
Tara Hui is a guerilla grafter who's returning ornamental fruit trees to production one branch at a time!