Abstract: Provided herein are energy storage devices. In some cases, the energy storage devices are capable of being transported on a vehicle and storing a large amount of energy. An energy storage device is provided comprising at least one liquid metal electrode, an energy storage capacity of at least about 1 MWh and a response time less than or equal to about 100 milliseconds (ms).

Abstract: A method of optimizing debt collection attitudinally classifies debtors into one of several attitudinal segments. The approach uses an assessment of current attitudes rather than past behaviors as to predict future behavior. Each segment can be addressed with an offer, which is a combination of attributes which together, have an expected, measurable, and predictable response from the debtor. Debt collection requires the expenditure of resources, at least one of which the availability of a relatively small number of debt collectors. The offers that can be extended to debtors are identified on a debtor-by-debtor, offer-by-offer basis to identify the best offer to propose to each debtor by the limited number of debt collectors in order to maximize the economic return from all debtors.

Abstract: A method of optimizing debt collection attitudinally classifies debtors into one of several attitudinal segments. The approach uses an assessment of current attitudes rather than past behaviors as to predict future behavior. Each segment can be addressed with an offer, which is a combination of attributes which together, have an expected, measurable, and predictable response from the debtor. Debt collection requires the expenditure of resources, at least one of which the availability of a relatively small number of debt collectors. The offers that can be extended to debtors are identified on a debtor-by-debtor, offer-by-offer basis to identify the best offer to propose to each debtor by the limited number of debt collectors in order to maximize the economic return from all debtors.