Abstract: A method for making shaped information-storage material of photo polymers includes mixing powdery azobisisobutyronitrile (AIBN) and powdery acenaphthenequinone (AQ) into liquid monomers of methyl methacrylate (MMA) and stirring a mixture of the AIBN, AQ, and MMA to form a solution. The azobisisobutyronitrile (AIBN) serves as a thermo polymerization initiator, and the acenaphthenequinone (AQ) serves as a photo polymerization initiator. The solution is filtered to remove the saturated photo polymerization initiator. Then, the filtered solution is poured into a shaping container and heated in the shaping container to make solid, shaped information-storage material of photo polymers. The shaping container is then opened to remove the shaped information-storage material of photo polymers. The shaped information-storage material of photo polymers includes two flat lateral sides.

Abstract: A pair of earmuffs A pair of earmuffs that allows folding in for storage and easy carry and fully coverage of the ears to keep off the bitter coldness; each earmuff essentially comprised of a disk, a retainer, a hook, a nut, and a cloth covering; the disk being wrapped up in the cloth covering, a tenon of the disk being inserted through a square hole in the retainer to hold the hook by means of two latching blades extended from the outer side of the retainer; a circular plate being extended from the front end of the latching blade; a rod inserted through both latching blades and locked to the nut; a groove provided on the circular plate contacting and holding against each other with multiple teeth provided on the inner edge of the nut to permit inching for adjustment of the optimal wearing comfort.