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4/18 Cover

Matter & Energy

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strontium atomic clock

RIGHT ON TIME  A new atomic clock contains two ultrasensitive thermometers (center) that enable scientists to account for heat-caused fluctuations that limit the clock’s precision.

Champagne bottles from shipwreck

Champagne recovered from a shipwreck off the coast of the Finnish Åland archipelago in the Baltic Sea has given chemists a glimpse of past winemaking methods.

Periodic table

FLEETING  Despite new results, controversy remains over where the radioactive element lawrencium (plus its upstairs neighbor lutetium) should be in the periodic table: in the d-block or f-block.

Matter & Energy

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