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Bill McGuire, professor of geophysical hazards at University College London, has written a book entitled Global Catastrophes: A Very Short Introduction in which he calculates the size of objects big enough, if they struck Earth, to end life as we know it.
FORBES: Magazine Article
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The task is further complicated by the relatively small size of the objects of the search.
CENTERFORSECURITYPOLICY: Don��t bother me with the facts
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"By using natural crystals for the first time, rather than artificial metamaterials, we have been able to scale up the size of the cloak and can hide larger objects, thousands of times bigger than the wavelength of the light, " said Shuang Zhang, the University of Birmingham physicist who led the research.
BBC: Invisibility cloaking benefits from crystal-clear idea
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Certainly, the Replicator marks a big step over its predecessor, the Thing-O-Matic, introducing dual-extrusion for two-colored printing and a much larger printing area, letting users create standalone objects roughly the size of a loaf of bread.
ENGADGET: MakerBot Replicator impressions: the dawning of 3D printers in every home?
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Below that 1km size, the fraction of as-yet undiscovered objects gets a lot larger.
BBC: Science & Environment
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New to the Cyber-shot line, the TX30 model features a Magnifying Glass Plus mode that zooms in for a fascinating super-size, magnification (up to 15x) of close objects such as fish, plants, insects and more.
ENGADGET: Sony brings Cyber-shot HX300, WX300 and TX30 to the US with fast autofocus
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Even Iran, which did not sign the final accord, says it objects more to American pressure than to the size of the final quotas.
ECONOMIST: Slick OPEC
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With some 160 objects and works of art, from a still growing collection already six times that size, the show sets out to illustrate 1, 000 years of Islamic artistic and scientific accomplishments in countries from China to Spain.
ECONOMIST: Works of art from the Aga Khan's collection on show in London
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Infrared light is emitted from all objects, even if they are dark, allowing a much more accurate calculation of their size and therefore their age.
BBC: Asteroid thought to kill dinosaurs may not be guilty