Methods and devices for delivering an agent to a solid tissue in vivo for assessment of efficacy are described. Said load sensor detects the load, the lifting fork, and the environment located in front of the forklift. The techniques include predicting the position of the sun during a time period, and sampling an output parameter of the array indicative of performance. The identifying the second set of media content occurs in response to at least one of: the current time matching a date and time combination specified by a user to remove the media content; and, playing the first set of media content.