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measles infection

MEMORY WIPE  Measles virus particles bud out from an infected cell (left) after replicating inside the cell in this colored electron micrograph.  

metal kilogram

HAS-BEEN  For 130 years, this metal cylinder was the definition of a kilogram. Now, it's just another hunk of metal, as scientists have instituted a new definition based on a quantity known as the Planck constant.

pollen

POOF! During allergy season, it’s hard not to take those puffs of pollen as a personal affront, but researchers are sorting out what plants get from their annoying-to-humans compounds.

quarks and gluons

TIED UP  Protons contain smaller particles called quarks and gluons (illustrated). Experimental data hint that quantum entanglement links those particles with one another.



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