freedoms and they are breaking a law that officially prohibits protests in the city of algiers. tensions has been rising in algeria since similar public protests ousted the president of neighboring tunisia. the recent flooding in australia may prove to be one of the most costly disasters in the nation's history. more than 3 million people have been affected. the federal treasurer says the floods have devastated crops and tourism and that coal exports are likely to be one of the biggest casualties. bernard madoff ran the most infamous ponzi scheme in recent history but he suspect alone. new scams surface every year and investors can lose millions before the truth comes out. cnn's poppy harlow reports on a minnesota ponzi scheme and the whistle-blower who helped expose it. >> the one instruction the fbi says is you can't break the law. >> reporter: in 2009, this man stumbled upon one of the biggest ponzi schemes in minnesota's