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The Leaning Tower of Pisa (Italian: Torre pendente di Pisa) ...
The bizarre ritual of throwing newborn babies off a temple ...
An intrinsic defect is formed when an atom is missing from ...
Helicopters have a rotor turned by an engine-driven shaft. ...
Invented by Farmer Wu Yulu in a village outside of Beijing, ...
Stem cells can divide symmetrically to generate daughter ...