The 50 Worst Inventions

From the zany to the dangerous to the just plain dumb, here is TIME's list (in no particular order) of some of the world's bright ideas that just didn't work out

Subprime Mortgages

MIAMI - OCTOBER 01:  A for sale sign is displayed outside a home on October 1, 2009 in Miami, Florida. Declining home prices, low mortgages rates and government

Joe Raedle / Getty Images

The flimsy piece of foundation that brought the U.S. economy tumbling into recession, subprime mortgages are risky loans given to people with shaky credit histories. When interest rates dipped in 2004, banks began granting mortgages to people who really, really shouldn't have had them. Even worse, many were structured adjustable-rate mortgages, with interest rates that climbed after the first few years. The result was a wave of foreclosures and banks with a lot of bad loans on their books. In short, financial catastrophe.

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