9th wiki-link game

I choose the third link...

1).  Sydney County, Pennsylvania  http://en.wikipedia.org/wiki/Snyder_County,_Pennsylvania
2).  Pennsylvania  http://en.wikipedia.org/wiki/Pennsylvania
3).  United States  http://en.wikipedia.org/wiki/United_States
4).  Constitutional Republic  http://en.wikipedia.org/wiki/Constitutional_republic
5).  Representatives  http://en.wikipedia.org/wiki/Representation_(politics)
6).  Constituents  http://en.wikipedia.org/wiki/Constituent_(politics)
7).  Constituent Assembly  http://en.wikipedia.org/wiki/Constituent_assembly
8).  Jon Elster  http://en.wikipedia.org/wiki/Jon_Elster
9).  Philosophy of Social Science  http://en.wikipedia.org/wiki/Philosophy_of_social_science
10).  Anthropology  http://en.wikipedia.org/wiki/Anthropology
11).  Social Sciences  http://en.wikipedia.org/wiki/Social_science
12).  Natural Sciences  http://en.wikipedia.org/wiki/Natural_sciences
13).  Universe  http://en.wikipedia.org/wiki/Universe
14).  Energy  http://en.wikipedia.org/wiki/Energy
15).  Energeia  http://en.wikipedia.org/wiki/Energeia
16).  Aristotle  http://en.wikipedia.org/wiki/Aristotle
17).  Plato  http://en.wikipedia.org/wiki/Plato
18).  Philosopher  http://en.wikipedia.org/wiki/Philosopher
19).  Metaphysics  http://en.wikipedia.org/wiki/Metaphysics
20).  World  http://en.wikipedia.org/wiki/World
21).  History http://en.wikipedia.org/wiki/History
22).  Past  http://en.wikipedia.org/wiki/Past
23).  Future  http://en.wikipedia.org/wiki/Future
24).  Millisecond  http://en.wikipedia.org/wiki/Millisecond
25).  Second  http://en.wikipedia.org/wiki/Second
26).  International System of Units  http://en.wikipedia.org/wiki/International_System_of_Units
27).  Base Units  http://en.wikipedia.org/wiki/SI_base_unit
28).  Metre  http://en.wikipedia.org/wiki/Metre
29).  Equator  http://en.wikipedia.org/wiki/Equator
30).  Axis of Rotation  http://en.wikipedia.org/wiki/Rotation
31).  Spin  http://en.wiktionary.org/wiki/spin

Point 31 sent me to Wiktionary.  GAME OVER