Training improves the ability of human observers to discriminate between two similar directions of motion. This gradual improvement is specific to the direction on which an observer is trained, enduring for several months. Improvement does not affect motion perception generally, nor does it depend on recognition of details of the movement. (Author)

Results of two studies were consistent with the view that 3-month-old infants perceive movement in depth during their own movement. They can move to avoid a surface just prior to contacting it. (Author/RH)

Assesses the effects of the specific route traveled, intervening barriers, and different lengths of routes on the spatial knowledge of second graders, sixth graders and college students for a novel experimental environment. (MP)

Provides information on the calculation of the redshift to blueshift ratio introduced by the transverse Doppler effect at relativistic speeds. Indicates that this shift should be mentioned in discussions of whether quasars are "local" rather than "cosmological" objects. (GS)

The evolution and change in Alexander Calder's mobiles--from the mid-1920's to his death in 1976--are discussed, and it is suggested that the creative art teacher can easily use Calder's design techniques to enhance an art education program. (KC)

Describes physics formulas which can be used by law enforcement officials to determine the possible velocity of vehicles involved in traffic accidents. These include, among others, the slide to stop-level road, slide to stop-sloping roadway, and slide to stop-two different surfaces formulas. (JN)

Reproduces a study reported in 1899 that compared the relative advantages of producing handwriting through finger, full arm, and forearm movements and that concluded that the forearm movement was the best of the three. (GT)

Results of an investigation into why individuals participate in specific sport, dance, or exercise activities are given. (JD)

This study was made to determine torque-generating capabilities at two speeds in active young boys and girls for the knee and elbow flexors and extensors. (JD)