Random Link Friday.

* Happy 90th Birthday, Nelson Mandela.

* With the passage of a major new wind power initiative, is Texas now the most energy-conscious state in the union?

* Top 10 7 religions you never knew existed. (Who didn't know about Jainism, Falun Gong, and the Rev. Sun Myung Moon's Unification Church?)

* Wikipedia's list of unsolved problems in diverse fields like physics, linguistics, economics, cognitive science, and philosophy.