Quite a few collapse, killing scores of people every year.

ECONOMIST: Italy��s beautifying bulldozers

Khartoum, Sudan (CNN) -- A gold mine in the western Sudanese state of Darfur collapsed this week, killing scores of people and leaving many still unaccounted for, an official says.

CNN: Dozens dead in Sudan mine collapse

Kiesling created the concept of the above-ground storm shelter after a tornado swept through Lubbock, Texas, in 1970, killing 26 people and demolishing scores of homes.

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