This Way Up for Saturday 15 August 2009
We're foraging for more free food with Johanna Knox. This week, onion weed's a bit like a wild spring onion and good in dips, breads, marinades and Asian cooking.
Zips are on everything nowadays. But the idea took about 40 years to get off the ground, two world wars got in the way, and tragedy struck one of its main inventors. Robert Friedel charts the history of the zipper.
Gaby Tschofen of the Swiss chocolatier Barry Callebaut reckons they've cracked the secret of heat resistant, low calorie chocolate.
We're off to San Francisco where Cyrus Farivar's visited a new producer using all sorts of hi-tech wizardry in the chocolate manufacturing process.
The southern Chinese city of Macau makes more money from gambling than Las Vegas and Atlantic City combined! Clifford Coonan's seen some changes in the 20 years he's bene visiting.
Bill Thompson on a new UK study of music downloading and young people's listening habits. Plus the US employers facing lawsuits from"hyperconnected"workers.
Trash Track's the name of a project in the US that's using location tags to track the journey your rubbish takes after you leave it on the kerbside. Assaf Biderman of MIT's leading the project.
Dr Nick Wade's one of the Australian scientists who reckons they've solved the mystery of what makes crabs, prawns and lobsters change colour when you cook them.