A rear deploying mechanical broadhead arrowhead is provided and includes a broadhead body having a body opening and a body length, wherein the broadhead body defines a body cavity and includes a plurality of slots, wherein each of the plurality of slots traverses a portion of the body length and is disposed such that each of the plurality of slots is on an opposing side of the broadhead body. The system preferably pushes the content to the user after correlation of content to the user’s learning profile. The connector can include a magnet for magnetically coupling the connector to the conductive surface disposed on the return pad. The topsheet is spaced generally upward from the core such that the storage space is disposed between the topsheet and the core. The code segments are subsequently executed within a transform or lighting module for processing vertex data. The link mechanism has levers fixed to rotary shafts of the doors, respectively, to rotate with the rotary shafts of the doors, a base fixed to the unit case, and a main link rotatably or slidably supported on the base, being engaged with the levers for rotating the levers when driven by a driving means.