An algorithm for scheduling the trajectory of a point object, which moves on a plane surface comprising a set of moving obstacles, is introduced. Different quantitative criteria may be met by the schedule, e.g., the course connecting two individual locations being the shortest in length, the least expensive, the fastest as regard to its duration, etc. A prototype system that implements the algo...

Einstein deduced (very briefly on p. 834 of [1], and in slightly more detail on pp. 820-822 of [2]) that the gravitational deflection of light according to general relativity is twice the “Newtonian” value. Einstein did not deduce the acceleration of light (or that of other fastmoving particles), which has perhaps left the impression that the acceleration at the surface of the Earth is no diffe...

When two overlapping, transparent surfaces move in different directions, there is ambiguity with respect to the depth ordering of the surfaces. Little is known about the surface features that are used to resolve this ambiguity. Here, we investigated the influence of different surface features on the perceived depth order and the direction of smooth pursuit eye movements. Surfaces containing mor...