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Some male birds and mammals congregate in communal courting grounds called leks.
Persian leopard (Panthera pardus ciscaucasica), also called Caucasian leopard
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers
Detonation is a secondary ignition of the air–fuel mixture. It is also called spark knock or ...