A microreactor comprises a reaction chamber, into which prescribed materials are introduced, a production chamber, and a channel for connecting the reaction chamber and the production chamber together. In some aspects, a contact lens includes: a substrate; one or more sensors disposed on or within the substrate, wherein the one or more sensors senses fatigue andor an emotional state of a wearer of the contact lens; and an antenna disposed on or within the substrate, that communicates information sensed by the one or more sensors. The secondary mass is rotatably connected to the primary mass.