Wall Street got a bump yesterday, after news over the weekend that the federal government is taking over Fannie Mae and Freddie Mac, the giant US mortgage companies. Both of them were judged too big to fail... their folding would create such havoc in the US economy, many argued, that they must be propped up with government support (aka: taxpayer money). So, what does this move mean for you? And what questions does it raise about the US economy? Adam Davidson, our econonaut, is back to explain.