The towers, no more than 20 stories high, were side by side when parts of the connected structures fell to the ground.

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While Steinhauer saw the change of time first-hand, some iReporters found that the landscape in other parts of the world retained structures from ancient times.

CNN: Connecting the past to present tougher than it looks

Dr Mahdavi is working on other lattice structures, including aerodynamic body parts for racing cars and special insoles for a firm that hopes to make the world's most comfortable stiletto-heeled shoes.

ECONOMIST: 3D printing

What will be in demand are intercontinental air travel, remote area access where air strips are spotty, air traffic control networks, aerospace fasteners capable of holding together lighter, stronger composite structures, airplane maintenance and overhaul, jet engines and spare parts galore.

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"To the extent that booms may engender excess leverage in systemically sensitive parts of our financial system, we need to ensure that regulations and institutional structures are designed to enhance market discipline in ways that keep risk-taking under control, " the official said.

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That a review takes place into the role and function of Special Branch to ensure there are clear structures and procedures for the management of intelligence between special branch and other parts of the force.

BBC: 'Flawed judgement' over Omagh