At Fukushima Daiichi, these have been big problems because the electricity needed to keep them cool was lost, allowing radiation levels to rise, after the earthquake and tsunami.
According to the Deutsche Bank Long-Term Asset Return Study, the last time interest rates were near current levels, in the 1950s, Treasury bonds lost 40% of their inflation-adjusted value over the following three decades.
He said the introduction of two-stage A-levels meant pupils had lost their previous freedom, in the first years after GCSEs, to think and read more widely, in the knowledge that the next exams were still some time off.