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Will it ever be possible to permanently delete online data?
Once an email is sent, it exists somewhere online forever. What if there were a delete button which could wipe material from the web permanently? Tadayoshi Kohno, of the University of Washington in Seattle, is working on just such a project.
How have advertisers and brand specialists convinced us to buy a commodity that is sold for a great deal more than it costs to produce? Louise Hidalgo looks at the exponential growth - and the cost - of the bottled water industry.
The Climate Connection: What's stopping us?
BBC World Service explores a key question in the story of action on climate change: what's stopping us?
Could wireless electricity be a reality soon?
The man who wrote the first ever computer virus
Mobile internet connection from almost any location
New technology for predicting crowd behaviour launches
Why New Yorkers are sending texts to river wildlife
'Barcodes' tackle bush meat trade
'Barcodes' tackle bush meat trade
