Abstract: A metamaterial, comprising: an auxetic lattice structure with snap-through buckling behavior comprising a plurality of rows; wherein the lattice defines a holey arrangement array; and cement, concrete or any other brittle materials disposed in the auxetic lattice structure.

Abstract: Techniques for enabling users logged-out of a social networking system to access content associated with the social networking system are described. For example, based at least in part on determining a user is unassociated with a social networking system, the social networking system may present content to the user. In some examples, the amount of content available to the user may be limited, in which the user may be prompted to create an account. In some examples, logged-out users may be prompted to pick topics associated with their interests, allowing the social networking system to curate content for logged-out users.

Abstract: The disclosure provides a microcapsule including: a core material, an inner membrane, and an outer membrane. The core material includes choline chloride and a carrier. The inner membrane includes at least one vegetable fat having a melting point higher than or equal to 60° C. The outer membrane includes rice bran wax, zinc oxide powders, and a film forming material. The film forming material is glucose phthalate, polyethylene glycol, or sodium alginate. The rice bran wax accounts for 5-10 wt. % of the microcapsule. The mass ratio of the rice bran wax to the zinc oxide powders to the film forming material is 1-5:0.1-1:0.1-1.