Maybe Canada has something to teach the U.S. about housing finance. One in four U.S. homes is thought to be worth less that the mortgage being paid on it. One in every 492 U.S. homes received a foreclosure notice in November. For the fourth year running, analysts are speculating on where the bottom is for U.S. real estate. No such worries up here in Canada - yet its system of mortgage finance gets little attention in the U.S. Not a single Canadian bank failed during the Great Depression, and not a single one failed during the recent U.S. crisis now dubbed the Great Recession. Less than 1 percent of all Canadian mortgages are in arrears.