A greenhouse comprising: a substantially transparent surface; a protective coating comprising a pigment and a binder. The apparatus is implemented within an interface unit connecting a plurality of servers to the Internet, which is connected to a plurality of clients. In another embodiment, the intermediate layer of flexible puncture-resistant material includes at least two belts of flexible puncture-resistant material with the lower and upper sheets welded in laminar relationship along their peripheries and between each adjacent pair of belts. The first conductive layer is patterned to form a plurality of trenches in the capacitor region. A track is also provided for sheathing a lower edge of the shear wall. The disposable liquid build material feed cartridge recovers unused liquid material from the radiation transparent build material carrier and recycles it through a filter into a supply reservoir for reuse.