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Clocks
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2. Isotopic clocks
2. Isotopic clocks
About one in a trillion atoms of carbon is the radioactive isotope 14C. It is a ‘cosmogenic isotope’ produced by the interaction between atmospheric nitrogen (N) and cosmic rays. T...
11. Cosmic stopped clocks
11. Cosmic stopped clocks
‘Cosmic stopped clocks’ explains how, using isotopes that are the daughters of isotopes that no longer exist, isotope geochemistry has been able to assemble a chronology for the fo...
American Telephone & Telegraph Company Building, first floor interior, consisting of the lobby spaces and the fixtures and components of these spaces, including but not limited to, wall and ceiling surfaces, floor surfaces, the steps adjoining the Dey Str
American Telephone & Telegraph Company Building, first floor interior, consisting of the lobby spaces and the fixtures and components of these spaces, including but not limited to, wall and ceiling surfaces, floor surfaces, the steps adjoining the Dey Str
New York (N.Y.). Landmarks Preservation Commission, Architecture, 2006, Landmark Preservation Commission...