Abstract: A method of unloading passengers from a vessel is provided, the vessel having passenger resting positions, an exit, and an aisle. The method includes grouping passengers into a plurality of groups including first, second, and third groups, and instructing the first group of passengers to gather their belongings and enter the aisle while the second and third groups to either remain in their passenger resting positions or out of the aisle. The method further includes instructing the passengers in the first group to exit the vessel. Further, the passengers in the second group are instructed to gather their belongings, enter the aisle, and exit the vessel while the third group of passengers remains in their resting position. Further, the third group of passengers is instructed to gather their belongings, enter the aisle, and exit the vessel. These groupings may be based on location of passengers, their travel status, or other suitable criteria.

Abstract: A spacecraft attitude and altitude control system utilizes sets of three pulsed plasma thrusters connected to a single controller. The single controller controls the operation of each thruster in the set. The control of a set of three thrusters in the set makes it possible to provide a component of thrust along any one of three desired axes. This configuration reduces the total weight of a spacecraft since only one controller and its associated electronics is required for each set of thrusters rather than a controller for each thruster. The thrusters are positioned about the spacecraft such that the effect of the thrusters is balanced.

Abstract: A chalkboard eraser including an elongated rigid tubular core member and a resilient body member fixed to the core member and disposed about the core member and generally coextensive therewith, the body member having alternate lands and grooves extending lengthwise and disposed about its periphery.

Abstract: A sleeping bag comprising a body portion, leg portions, and two sleeve members, first attachment structure fixed to the body portion, and second attachment structure fixed to a first of the sleeve members, the first and second attachment structures being releasably connectable to permit connection of the first sleeve member to the body portion, the first sleeve member having an opening in a free end thereof adapted to receive a free end of a second of the sleeve members, third attachment structure disposed on the interior of the first sleeve member, and fourth attachment structure disposed on the exterior of a second of the sleeve members, the third and fourth attachment structures being releasably connectable.