Abstract: Systems for harnessing power through electromagnetic induction utilizing printed coils are provided. A system can include one or more moveable magnets adjacent to printed coils on a circuit. For example, a system can include one or more magnets that are operative to move alongside a circuit board that includes printed coils. The one or more magnets may move, for example, when a user shakes the system or when the user walks or runs while holding the device. The movement of the one or more magnets may create an electromotive force (e.g., a voltage) across the printed coils, and this force may be used to generate electric power.

Abstract: Systems, methods, and machine-readable media are disclosed for providing an audio preview of songs and other audio elements. In some embodiments, the electronic device can provide a user-controllable pointer scrollable through various categories, such as different genres or artists. Responsive to each movement of the pointer, the electronic device can select a song from the pointed-to category and can play a portion of the selected song. In other embodiments, music groups can be defined, where each music group includes songs that go well together. The electronic device can play, in succession, a portion of one song from each of the music groups. Responsive to a user selection of a playing portion, the electronic device can create a playlist based on the music group of the selected playing portion.

Abstract: Systems, methods, and machine-readable media are disclosed for providing graphical representations of music of varying levels of detail. An electronic device can determine the attributes of a first type (e.g., genre) associated with the music. The electronic device can display a graphical representation of the music using the attributes. The graphical representation can be based on a spiral, helix, map, or any other geometric shape or curve. A user can zoom into a portion of the graphical representation to select the music of a particular genre in which to view more detailed information. In response, the electronic device can determine the attributes of a second, more detailed type (e.g., artist) associated with the selected music and can revise the graphical representation to use the attributes of the second type. The revised graphical representation can include album cover art associated with the selected music.

Abstract: This is generally directed to identifying unauthorized users of an electronic device. In some embodiments, an unauthorized user of the electronic device can be detected by identifying particular activities that may indicate suspicious behavior. In some embodiments, an unauthorized user can be detected by comparing the identity of the current user to the identity of the owner of the electronic device. When an unauthorized user is detected, various safety measures can be taken. For example, information related to the identity of the unauthorized user, the unauthorized user's operation of the electronic device, or the current location of the electronic device can be gathered. As another example, functions of the electronic device can be restricted. In some embodiments, the owner of the electronic device can be notified of the unauthorized user by sending an alert notification through any suitable medium, such as, for example, a voice mail, e-mail, or text message.

Abstract: This is directed to an electronic device having an integrated sensor for detecting a user's cardiac activity and cardiac electrical signals. The electronic device can include a heart sensor having several leads for detecting a user's cardiac signals. The leads can be coupled to interior surfaces of the electronic device housing to hide the sensor from view, such that electrical signals generated by the user can be transmitted from the user's skin through the electronic device housing to the leads. In some embodiments, the leads can be coupled to pads placed on the exterior of the housing. The pads and housing can be finished to ensure that the pads are not visibly or haptically distinguishable on the device, thus improving the aesthetic qualities of the device. Using the detected signals, the electronic device can identify or authenticate the user and perform an operation based on the identity of the user.