Matter & Energy

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TWISTED MESSAGE  A radar tower at the Central Institute for Meteorology and Geodynamics in Vienna was used to beam photons imparted with a twist to a detector three kilometers away.

MEASURING UP  This metal cylinder is the United States’ copy of the international kilogram kept in France. Scientists hope to replace this standard, the last physical object used to define a unit of the metric system, with a definition of mass based upon fundamental physical constants.

Folded layers of carbon nanotubes

BEND, BUT DON’T BREAK  Folded layers of carbon nanotubes, seen under a scanning electron microscope, allow an elastic fiber to conduct electrical current when stretched.

Matter & Energy

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