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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
lion cubs in the wild, South Africa
Earth as viewed from Lunar orbit during the Apollo 8 mission, Christmas Eve, 1968. Africa is at the
Two-point linear perspective.
Ischemic compression (i.e., direct pressure) to a trigger point in the trapezius muscle.
Two radio antennas are 130 m apart on a north-south line. The two antennas radiate in phase at ...