Repeated Testing in Eyewitness Memory: A Means to Improve Recall of a Negative Emotional Event

Participants viewed either a violent, arousing film or a non-violent, control version of the same film. After viewing the film, they made three successive attempts to recall details of the event. Participants who were exposed to the negative emotional event were better than control participants at recalling details of the event itself, but they were worse at recalling details that preceded or followed the violence. Both groups of participants recalled significantly more information over successive recall attempts, suggesting that memory impairment due to arousal can be alleviated by repeated testing. Repeated testing was also associated with a small but reliable increase in memory intrusions. The implications of these findings for research on hypermnesia and on the relationship between arousal and memory are discussed

Search for Low Delta V Earth-To-Moon Trajectories

A search for low Δ V Earth-to-Moon trajectories has been initiated. Numerical integration of the equations of motion from the circular restricted three-body problem has resulted in the computation of a trajectory that saves more than 100 m/s over a Hohmann transfer, although the flight time is almost ten months. The approach used involves the computation of two trajectory \u27legs\u27: first, a trajectory from low Earth orbit to the L1 libration point of the Earth-Moon system, and second, a trajectory from L1 to an orbit about the Moon. Multiple orbits about Earth using lunar perturbations facilitates the transfer to L1. Similarly, the L1 to Moon leg uses the perturbation from the Earth to achieve a low orbit about the Moon. Small maneuvers are used in both legs to control the orbital period so the third body perturbations can be used advantageously