Another from the BBC, this time for Saturday.
A car that runs on just hydrogen and solar power has completed a journey through Australia - the first crossing of a continent for a car of this type.
The organisers say the gruelling 4,000 km [about 2500 miles, Americans] trip shows greener alternatives to the traditional internal combustion engine can be developed.
The exhaust emissions of the Japanese-built car consist of pure water.
Sydney's Lord Mayor sampled a glass of it when the experimental vehicle arrived there from Perth.
The trip took nine days. Organizer Hans Tholstrup said they could have done it in four but "we didn't want to take any chances."
"If you're asking when this technology could be commercially viable, then the answer is 'how long is a piece of string?'," Mr Tholstrup added.
In case you don't get that, it translates to "There's no definite answer but pretty much any time someone with the finances wants to."
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