Abstract: A supernumerary robotic limb (SRL) system can include a plurality of rigid links, a joint that connects one rigid link to another rigid link in the plurality of rigid arms, and two variable stiffness actuators (VSAs) configured to drive the plurality of rigid links in order to complete at least one task. The VSAs can exhibit infinite rotation and infinite stiffness. The VSAs can include an output link. Additionally, the VSAs can include a set of elastic elements mounted on the output link. The VSAs can include an input link configured to provide kinetic energy for the output link. The VSAs can include a dynamic chassis configured to connect with the input link. Additionally, the VSAs can include a stiffness adjustor included in the dynamic chassis and configured to adjust an elastic transmission between at least one elastic element of the set of elastic elements and the output link.

Abstract: A liquid nail polish remover applicator that permits disposal of soiled absorbent material within the applicator. The applicator is formed as a hollow housing member having a first chamber which houses a wetted coiled strip of absorbent material and a second chamber which receives soiled absorbent material, the first and second chambers being separated by a flexible membrane which permits enlargement of the space within the second chamber by displacement of the space within the first chamber. The absorbent material is fed through said housing member by a manually operated gear mechanism. An opening is formed within the housing member between said first chamber and said second chamber to selectively expose axial portions of the absorbent matrial.