The idea of expansion and contraction is
interesting: rapid expansion of populations
(when selection is relaxed) vs. rapid contraction
of populations (when selection is intensified).
The human population went indeed through a
phase of rapid expansion in the last decades while
natural selection was released through cultural
and technological progress.
Seed Magazine has an article about human
evolution and relaxed selection, too
http://www.seedmagazine.com/news/2008/10/how_we_evolve_1.php
-J.
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