But the ruling said the some weight should be given to "the level of local unmet need and considers that national and regional need for more permanent gypsy sites also has material weight".

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After a planning dispute with British Romany Gypsies in Beausale, in Warwick district, in 2011, the inspector acting for the Secretary of State said some weight should be given to "the level of local unmet need and considers that national and regional need for more permanent gypsy sites also has material weight".

BBC: Warwick council seeks land for Gypsy sites

It uses the same composite-material technology to reduce weight and hence fuel consumption.

ECONOMIST: Face value

Compared with aluminium, the weight saving is still around 30 percent, while the material is considerably thinner.

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So the only sensible material for reducing a conventional car's weight while maintaining its strength is aluminium.

ECONOMIST: Tech.view: Unbearable lightness? | The

Lower turbines should, together with clever design and material selection, help reduce the turbines' weight, and thus their need for ballast, which in turn should reduce sub-sea costs.

BBC: Floating challenge for offshore wind turbine

Last year, she reported that her group had synthesised a nanofibre material capable of storing 65% of its own weight of hydrogen.

ECONOMIST: Space-age soot

Members of the group taking monthly classes were mailed the same material as those who attended classes weekly, and those who failed to meet weight-loss goals could get individual counseling by phone or in person.

WSJ: Not All Calories Equal, Study Comparing 3 Diets Shows

Seung Mi Lee of South Korea's Kunsan University and her team announced a nanotube material at the conference that, they claimed, could store more than 14% of its own weight of hydrogen.

ECONOMIST: Space-age soot