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Some male birds and mammals congregate in communal courting grounds called leks.
Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th
A woman in a net on a Congo shore. Although the importation of slaves was illegal after 1807, histor
Santiago Calatrava, Port Authority Trans Hudson (PATH) station, World Trade Center site.
Exterior View of Tholos, The So-called Treasury of Atreus
A thin cleft, called the synapse, separates one cell from another.