STUMPED  Perhaps because only the upper body shows in the photo, this hairy woodpecker confused the Merlin photo ID program. 

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.

LASER TAGS  Seven of the cells in this micrograph contain lasers in the form of plastic beads (green). The cells are enclosed in red; the nuclei are blue.

MERS virus particles

DEADLY TARGET  A human immune protein might combat the MERS virus, shown here in yellow in a camel’s cells. No vaccine currently exists for MERS, which has infected over 1,300 people and killed around 500 since the virus was first identified in 2012.  

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