Geektimes, discussion of the formula E=mc^2:

XXX: Is the energy released or absorbed? The mass has increased / decreased.
YYY: Do I understand correctly that it is theoretically possible to create a mechanism that will only consume energy and deliver on the output of the sausage?
zzz: You can, but the sausage will be expensive: 5 terawatt-hours of energy per 200g. the cabbage.
aaa:... and the physics of the process is described by a three-dimensional surface known as a rotational sausage :)