Software Disasters

1985 Therac-25Six patients were given extreme overdoses of radiation for cancer treatment, killing or causing serious injury
1994 Pentium ProcessorCould not calculate certain floating-point divisions correctly
1996 Ariane 5 rocketExploded due to reusing tested software from Ariane 4 - that hadn't been tested for Ariane 5's new route
1999 Mars landerCrashed due to english units being interpreted as metric units
2003 Ohio blackoutAn alarm software failed to warn of power failure and caused a blackout from Canada to the US