A screen overlay for a personal electronic device coupled with an educational application launched on the device provides a work surface for engaging in fluidic based chemistry experiments while shielding the device from the liquid used for the experiments. The screen overlay has liquid encapsulating regions for retention of a pooled liquid deposited on the overlay, and is transmissive of touch signals to a touch screen on the device. An educational application executing on the device renders predetermined regions on the device display that are coordinated with the fluid retention regions. A liquid deposition vessel such as a dropper has a conductive outer surface for engaging a user's grasp, and a wire or conductor is adapted to extend through the pooled liquid for contact with the screen overlay. The screen overlay is transmissive of capacitance signals emanating from the user for indicating fluidic presence to the educational application on the device.

This periodic table of elements provides tactile features particularly suited for a visually impaired user. The table provides raised element field borders and raised alphanumeric characters which correspond to a standard periodic table. The element fields are arranged in a perpendicular grid upon a semi-rigid substrate. At least one (1) linear fold line enables isolation of a portion of the chart allowing a user to focus upon a desired “energy section”, “group”, or “family” of elements contained within the chart.

This periodic table of elements provides tactile features particularly suited for a visually impaired user. The table provides raised element field borders and raised alphanumeric characters which correspond to a standard periodic table. The element fields are arranged in a perpendicular grid upon a semi-rigid substrate. At least one (1) linear fold line enables isolation of a portion of the chart allowing a user to focus upon a desired “energy section”, “group”, or “family” of elements contained within the chart.

A hydrogel composition, a tissue model, and a method of manufacturing the tissue model by which time and cost for manufacturing the tissue model can be reduced while the viscosity of the tissue model can be suitably maintained is provided. A hydrogel composition is used for a tissue model and comprises a polyvinyl alcohol and a pseudoplastic compound. A tissue model comprises the hydrogel composition. A manufacturing method for a tissue model comprises a step of preparing a solution including a polyvinyl alcohol and a pseudoplastic compound, and a step of discharging the solution into a mold of the tissue model at a shear rate of 0.01 to 300 sec.sup.−1.

A skin-mimicking device includes a body and a plurality of conduits defining a plurality of fluid paths to an outer surface of the body. The skin-mimicking device is configured to simulate various skin perspiration conditions by controlling a flow rate of a sweat mimicking fluid through the plurality of conduits as well as simulate the mechanical properties of skin by tuning a composition of the body.

A skin-mimicking device includes a body and a plurality of conduits defining a plurality of fluid paths to an outer surface of the body. The skin-mimicking device is configured to simulate various skin perspiration conditions by controlling a flow rate of a sweat mimicking fluid through the plurality of conduits as well as simulate the mechanical properties of skin by tuning a composition of the body.

A non-transitory computer-readable medium storing instructions executable by a hardware processor to create a plurality of adaptive grids, present an adaptive hexagon grid in a drawing window on a display, prompt a user to create a first chemical structure on the adaptive hexagon grid, present a first plurality of atomic bond representations on the display, receive a first location selection chosen by the user from the adaptive hexagon grid, present a first plurality of atomic bond representations on the display, receive a first atomic bond selection chosen by the user from the first plurality of atomic bond representations, and present the first atomic bond selection at the first location selection on one of the plurality the adaptive grids. The first plurality of atomic bond representations include at least a single covalent bond representation and a double covalent bond representation.

A non-transitory computer-readable medium storing instructions executable by a hardware processor to create a plurality of adaptive grids, present an adaptive hexagon grid in a drawing window on a display, prompt a user to create a first chemical structure on the adaptive hexagon grid, present a first plurality of atomic bond representations on the display, receive a first location selection chosen by the user from the adaptive hexagon grid, present a first plurality of atomic bond representations on the display, receive a first atomic bond selection chosen by the user from the first plurality of atomic bond representations, and present the first atomic bond selection at the first location selection on one of the plurality the adaptive grids. The first plurality of atomic bond representations include at least a single covalent bond representation and a double covalent bond representation.

A construction teaching set for education. A polyhedral block body has first and second divided members and provided by engaging and assembling of the first and second divided members. Each of the first and second divided members has a rectangular plane, a plurality of rectangular inclined surfaces adjoining sides of the rectangular plane, triangular connectors formed between the adjacent rectangular inclined surfaces, and a plurality of vertical skirts extending from the plurality of rectangular inclined surfaces and the triangular connectors. A connection bar has a protruding fastener at one end or both ends to be selectively connected to one among a first fastening hole passing through the rectangular plane, second fastening holes passing through the plurality of rectangular inclined surfaces, and third fastening holes formed in a pair of the vertical skirts adjoining each other. A coupling unit generates coupling force for the first and second divided members.

A construction teaching set for education. A polyhedral block body has first and second divided members and provided by engaging and assembling of the first and second divided members. Each of the first and second divided members has a rectangular plane, a plurality of rectangular inclined surfaces adjoining sides of the rectangular plane, triangular connectors formed between the adjacent rectangular inclined surfaces, and a plurality of vertical skirts extending from the plurality of rectangular inclined surfaces and the triangular connectors. A connection bar has a protruding fastener at one end or both ends to be selectively connected to one among a first fastening hole passing through the rectangular plane, second fastening holes passing through the plurality of rectangular inclined surfaces, and third fastening holes formed in a pair of the vertical skirts adjoining each other. A coupling unit generates coupling force for the first and second divided members.