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(a) Mean duration (days) and (b) average maximum depth (mm) of snow cover throughout northern latitu
the comet Encke riding along its pebbly trail of debris (long diagonal line) between the orbits of M
In 2013, Americans learned that the federal government massively surveys their phone calls and e-mai
On November 11, 1887, four anarchists were hanged in Chicago on charges that they had thrown a bomb
Average household size
Subsurface mining takes place in underground tunnels