If we stick to the zero interest rate policy for too long, we risk a degree of economic instability much more extreme and costly than the recent financial crisis.

When the Duke scientists say "ultra-cool" they mean uber-cooled to around 150 micro-Kelvin — that's only a few billionths of a degree Kelvin above absolute zero.

Online brokerages had a low degree of differentiation, at 17 percent - but that's still better than Banks at zero.