Abstract: One embodiment of this disclosure can provide a pair of augmented reality (AR) glasses. The AR glasses can include a pair of lenses, with at least a portion of a lens of the AR glasses functioning as a see-through display; a frame comprising rims surrounding the lenses; a rear-facing camera embedded in a rim and configured to capture) images of a corresponding eye of a user while the user is wearing the AR glasses; and a user-authentication system to authenticate the user based on the captured eye images. The result of the user authentication is displayed on the see-through display.

Abstract: A detachable tray for a ladder includes a container for retaining supplies, a bracket assembly pivotally coupled to the container that is adapted to be releasably secured to the ladder, and a handle pivotally connected to the container to facilitate tray transport. The bracket assembly includes a rung engaging bracket that is movably connected to a base by a pair of transverse threaded members. A gap is defined between the bracket and the base that is dimensioned to fittingly receive one side rail of the ladder, the width of the gap being adjustable to accommodate side rails of varying widths. A support block is slidably coupled to a side of the base by a pair of posts. Together, the base and the support block apply a firm abutment force against the opposite side of the side rail than the bracket, thereby stabilizing the tray in place on the ladder.

Abstract: A detachable tray for a ladder includes a container for retaining supplies, a bracket assembly pivotally coupled to the container that is adapted to be releasably secured to the ladder, and a handle pivotally connected to the container to facilitate tray transport. The bracket assembly includes a rung engaging bracket that is movably connected to a base by a pair of transverse threaded members. A gap is defined between the bracket and the base that is dimensioned to fittingly receive one side rail of the ladder, the width of the gap being adjustable to accommodate side rails of varying widths. A support block is slidably coupled to a side of the base by a pair of posts. Together, the base and the support block apply a firm abutment force against the opposite side of the side rail than the bracket, thereby stabilizing the tray in place on the ladder.

Abstract: The present invention relates to mutants of lactic acid bacteria which are resistant to the antibiotic ampicillin and which were found to give an increased texture when grown in milk while maintaining the other growth properties of the parent strain. The present invention, furthermore, relates to compositions comprising such mutants, and to dairy products fermented with the lactic acid bacteria resistant to ampicillin.