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Le Grand K

SPECIAL K  Carefully secured under bell jars, a metal cylinder known as Le Grand K defines the kilogram. Now, scientists are doing away with that benchmark, instead relying on a fundamental constant, the Planck constant, to define the kilogram.  

Camp Fire destruction in California

TORCHED TOWN  The Camp Fire burned through the town of Paradise in Northern California, leaving behind rubble where houses and businesses once stood.

mammoth, mastodon, and gomphothere

MAMMOTH WORLD  A Columbian mammoth (Mammuthus columbi), an American mastodon (Mammut americanum) and a gomphothere (Cuvieronius) were among the prehistoric elephant relatives that roamed North America and Eurasia until the end of the last ice age.

blacklegged tick Ixodes scapularis

PERSISTANT PEST  The bacteria that cause Lyme disease are spread by infected ticks, including the blacklegged tick Ixodes scapularis.



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