Abstract: The invention relates to a lighting device with a grid bounding a plurality of light cells arranged in a two-dimensional array. Each light cell being associated with a light source that can be selectively controlled so as to be turned on or turned off, in order to be able to generate a light-based pictogram on the two-dimensional array. The grid bears against a support for the light sources and is held in place by mechanical clamping by means of a closing lens secured to the support. During assembly, the grid is slightly compressed in order to be held in place. For this, the grid is formed of a material that has a Shore hardness of less than 90, so as to be flexible and allow such compression and/or deformation.

Abstract: Three-dimensional models of molecules, including proteins, and molecular model construction kits, including an alpha helix construction kit, a beta sheet construction kit, and a nucleic acid construction kit. The three-dimensional models of molecules include one or more elongated tubular strands representing alpha carbons and the bonds between the alpha carbons. The alpha helix and beta sheet construction kits include amino acid backbone units, hydrogen bond units, and side chain units. The nucleic acid construction kits include base units, hydrogen bond units, sugar units, and phosphate units.

Abstract: Three-dimensional models of molecules, including proteins, and molecular model construction kits, including an alpha helix construction kit, a beta sheet construction kit, and a nucleic acid construction kit. The three-dimensional models of molecules include one or more elongated tubular strands representing alpha carbons and the bonds between the alpha carbons. The alpha helix and beta sheet construction kits include amino acid backbone units, hydrogen bond units, and side chain units. The nucleic acid construction kits include base units, hydrogen bond units, sugar units, and phosphate units.