BERKELEY — Six months after Tristan Anderson, a former UC Berkeley tree sitter and Bay Area activist, nearly died after being struck in the head with a tear-gas canister fired by Israeli troops, friends are holding a benefit Sunday to raise money for his recovery costs. Anderson, 38, remains at a rehabilitation hospital near Tel Aviv and continues to have setbacks and infections after skull surgery last month, supporters said. The operation came after doctors learned Anderson was suffering from

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