Abstract: A vehicle designed to harness the kinetic energy of a stream of gas or liquid aimed in a constant direction toward its front end, with the surprising and educational result that it moves into the oncoming stream.

Abstract: A movie storage, traversal, annotation, and viewing method and apparatus comprised of a graphic output device {such as a monitor} (36), random-access storage media {such as semiconductor memory, a hard disk, or combination} (16), and computation device (14) connecting them. Temporal progression through a movie frame sequence {which may have different temporal frame densities at different regions of the sequence} (200) is determined at view time through: Direct manipulation of user-controlled physical actuators {such as dial(s) (32) with attached rotary encoder(s) (30)}, mathematical functions of time, algorithmically-processed music {102}, or in response to environmental stimuli {such as temperature, light level, and other similar parameters}.