Abstract: An article including a series of different cereal box sleeves dimensioned to fit over a cereal box, each of the sleeves including content printed or otherwise formed thereon, wherein the content is a subject unrelated to cereal contained in the cereal box, wherein a common theme connects the content of the sleeves in the series of the sleeves.

Abstract: A communication system including a fluid-operated calling device mounted in a first location in a building, and a fluid-operated indicator mounted in a second location in a building and in fluid communication with the fluid-operated calling device, wherein actuation of the fluid-operated calling device causes the fluid-operated indicator to provide an indication that the fluid-operated calling device has been actuated. A fluid-operated lock may be mounted near the fluid-operated calling device and in fluid communication with a fluid-operated actuator, wherein actuation of the fluid-operated actuator causes opening of the fluid-operated lock.

Abstract: An article including a cereal box sleeve dimensioned to fit over a cereal box. The cereal box sleeve may include content thereon (e.g., advertising, educational or entertainment content).

Abstract: A communication system including a fluid-operated calling device mounted in a first location in a building, and a fluid-operated indicator mounted in a second location in a building and in fluid communication with the fluid-operated calling device, wherein actuation of the fluid-operated calling device causes the fluid-operated indicator to provide an indication that the fluid-operated calling device has been actuated. A fluid-operated lock may be mounted near the fluid-operated calling device and in fluid communication with a fluid-operated actuator, wherein actuation of the fluid-operated actuator causes opening of the fluid-operated lock.

Abstract: An energy harvester and method for electrical energy harvesting from electromagnetic interference, generated by electrical wiring and/or an electrical appliance, by receiving electromagnetic field energy radiated by the electromagnetic interference and converting the electromagnetic field energy to an electrical current for powering an electrical device. The voltage associated with the electrical current may be increased in preparation for powering the electrical device. The electrical current may be stored in preparation for powering the electrical device.

Abstract: An energy harvester and method for electrical energy harvesting from electromagnetic interference, generated by electrical wiring and/or an electrical appliance, by receiving electromagnetic field energy radiated by the electromagnetic interference and converting the electromagnetic field energy to an electrical current for powering an electrical device. The voltage associated with the electrical current may be increased in preparation for powering the electrical device. The electrical current may be stored in preparation for powering the electrical device.

Abstract: A communication system including a fluid-operated calling device mounted in a first location in a building, and a fluid-operated indicator mounted in a second location in a building and in fluid communication with the fluid-operated calling device, wherein actuation of the fluid-operated calling device causes the fluid-operated indicator to provide an indication that the fluid-operated calling device has been actuated. A fluid-operated lock may be mounted near the fluid-operated calling device and in fluid communication with a fluid-operated actuator, wherein actuation of the fluid-operated actuator causes opening of the fluid-operated lock.

Abstract: A remotely operable teaching system includes hardware for interfacing with the public telephone network and for accepting incoming telephone calls. The computer system accepts personal identification codes from calling students and allows the students to access predetermined portions of pre-recorded educational material stored in the computer system. The system generates reports of the incoming telephone calls which provide information about the use of the stored educational material by the students.