The influence particular companies wield on the 16 policy committees that shape the Chamber's stance on everything, from environmental regulation to e-commerce, is unclear.

ECONOMIST: Corporate lobbying

The name derives from the hemispherical shape of the combustion chamber.

FORBES: The Engine That Could

The Hemi, made by DaimlerChrysler AG's Chrysler Group, is the nickname for a series of engines known for their dome-shape--or hemispherical--combustion chamber.

FORBES: Magazine Article

The consortium tested the practicalities of using a printer on the Moon by setting up a D-shape 3D printer, which are used to print very large house-sized structures, in a vacuum chamber with simulated lunar material.

BBC: 3D printed moon building designs revealed