If subjected to pressure, though, the molecules lock together and behave like a solid.

ECONOMIST: Monitor: Fluid defences | The

Nations have come together to lock down nuclear materials, and America and Russia are reducing our arsenals.

WHITEHOUSE: Remarks by the President to the UN General Assembly

It's manifested in the progress we've made on nuclear security and nonproliferation through the New START Treaty and our efforts to lock down nuclear materials together, and it's manifested, frankly, in the fact that, even as we speak now, the Russians are hosting the P5-plus-1 talks in Moscow aimed at getting Iran to live up to their international obligations.

WHITEHOUSE: Press Briefing by Jay Carney and Ben Rhodes

Hurricane Sandy will probably add to this downward momentum by effectively bunching these big lock-up releases closer together.

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But Caerphilly also pieced together some good early phases and both lock Jarred Lougher and flanker Danzi Niblo were worked over for tries.

BBC: Swansea qualify for Europe

Hamilton's attempt to put together the perfect lap was not helped by several lock-ups, with the McLaren driver coming unstuck at the Bico de Pato and in the Senna S combination.

BBC: Massa gains upper hand in Brazil