The Best of the Week’s News

• “Wal-Mart is the embodiment of our broken economic system,” says AFL-CIO president Richard Trumka. 
   
• New York City teacher speaks out against the burden of standardized testing.
   
• GOP probe of Planned Parenthood finds no evidence of wrong-doing. 
   
• A newly-discovered gene accounts for elephants’ enviably low cancer rates.
   
• A Russian journalist who chronicled Chernobyl wins the Nobel Prize in Literature.