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focuses on the 'Big Spin' model of gravity.
http://www.antigravity.org/
http://www.gyro-scope.co.uk/
basic research on gravity and related phenomena.
http://www.gravitation.org/
series of introductory physics lessons in online format.
http://www.lightandmatter.com/
a new set of field equations proposed in terms spinors unifying gravitational fields with other well known fields.
http://www.fieldtheory.org/
presents an article by Cao Junfen.
http://www.coldpressure.com.cn/