NARRATOR: This investigation takes place on the weekend before the clocks change and also on the weekend after clock change. You will need… sleep diaries, rulers, conversion tables, reaction ...
The US Open Series instituted a serve clock at several of its events this summer, and any rule change in uber-traditional tennis is bound to leave both players and fans with some questions.
What is the molecular clock? Levels of molecular variation could be used, in principle, to estimate divergence times, serving as evolutionary "clocks" that "tick" at different rates. Subsequent ...
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