Abstract: A circuit board connection structure includes an adapter circuit board and an interface circuit board. The upper board face of the adapter circuit board is provided with a connection via, and an arcuate adapter pad coaxial with the connection via. A conductive pin is secured to the arcuate adapter pad. The conductive pin is provided with a protrusion. The lower board face of the interface circuit board is provided with a rotation shaft, and an arcuate interface pad coaxial with the rotation shaft. The rotation shaft is inserted into the connection via. The interface circuit board is configured to swing relative to the adapter circuit board about the axis of the rotation shaft. The protrusion is pressed against the arcuate interface pad and is configured to slide relative to the arcuate interface pad.

Abstract: A method for an open knowledge system accessible via the Internet includes: managing, by a server, access to informational content of the open knowledge system; communicating, from the server to user devices, computer-executable instructions which, when executed on a user device, generate an interface enabling users to contribute to the informational content; and (c) communicating, from the server to user devices, computer-executable instructions which, when executed on a user device, display informational content for a particular topic, and in conjunction therewith, an advertisement of a contributing user who has contributed to the informational content for the particular topic. The displayed advertisement preferably is not displayed in correlation to the contribution of the contributing user to the informational content for the particular topic.

Abstract: A method of providing an open knowledge system includes: providing, via network communications, access by users to the open knowledge system; searching the open knowledge system for informational content by comparing metadata in the open knowledge system with user-specified search data, the metadata in the open knowledge system representing particular topics for which informational content is stored in the open knowledge system; presenting informational content for view by the users, the informational content resulting from the searching based on the comparison of the metadata with the user-specified search data; and enabling users to modify the metadata in the open knowledge system that represents the presented informational content resulting from the searching based on the comparison of the metadata with the user-specified search data. Relevant informational content thereby may be more readily viewed as a result of the searching by comparing metadata with user-specified search data.