Topic Image Rail

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.


JET SET  An active galaxy called a blazar, illustrated here, emits a jet of high-energy particles toward Earth. 

E. coli illustrated

GOING WITH THE FLOW  E. coli, illustrated here, use their flagella to swim. A new study reveals that bacteria’s synchronized swimming can eliminate a liquid’s resistance to flow.

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