Human-powered generator

A device, comprising:

• a frame;
• an actuator attached to the frame and slidaby movable with respect to the frame along a linear axis;
• a helical member positioned within the frame and rotatably movable with respect to the frame about a helical axis of the helical member, wherein the helical axis is parallel to the linear axis;
• and
• an electrical generator coupled to the helical member such that rotation of the helical member about the helical axis of the helical member causes the electrical generator to generate electricity,
• wherein the actuator and the helical member are configured to cooperate with one another such that (a) motion of the actuator along the linear axis in a first linear direction causes corresponding rotation of the helical member about the helical axis in a first rotational direction and (b) motion of the actuator along the linear axis in a second linear direction that is opposite the first linear direction causes corresponding rotation of the helical member about the helical axis in a second rotational direction that is opposite the first rotational direction.