Abstract: A collapsible assembly configured to change, along a collapsibility axis, between an extended configuration and a collapsed configuration is described. The collapsible assembly comprises at least two symmetrical peripheral units, each comprising a primary cell and a secondary cell. The primary cell includes a corresponding cell surface and a primary cell hinge element. The secondary cell includes a corresponding cell surface and a secondary cell hinge element, where the secondary cell hinge element is complementary to the primary cell hinge element. The collapsible assembly also includes an intermediary cell positioned within the two peripheral unit assemblies and is coupled to the secondary cells of each peripheral unit assembly using coupling elements.

Abstract: A sports ball for use in baseball-type games includes a hollow, substantially spherical plastic ball that has a plurality of substantially planar, intersecting regions covering an outer surface thereof. Preferably the ball also has a weight that is substantially less than a weight of a regulation baseball, for enhancing safety in use. The sports system further includes a bat for use with the ball, or with any similar ball, preferably a plastic ball. The bat is a hollow, elongated member that has a handle portion adjacent a bottom end and a barrel portion between the handle portion and a top end. The bat further has a sheath surrounding at least a portion of the barrel portion. The sheath has a coefficient of friction higher than a coefficient of friction of a surface of the barrel portion, for imparting “traction” to a struck ball.

Abstract: A modular wall structure can include a first modular unit having a first face defined by a first perimeter and a second modular unit having a second face defined by a second perimeter. The first modular unit can be operably and selectively coupled to the second modular unit. Base units can be provided to support the first and second modular units.

Abstract: The fire extinguishing tarpaulin is configured for use extinguishing a chemical combustion reaction in an area of conflagration. The fire extinguishing tarpaulin comprises a fire tarpaulin, a rocket system, and an aircraft. The fire tarpaulin forms a gas impermeable barrier that limits the chemical combustion by limiting access to the oxygen required to sustain the chemical combustion reaction. The rocket system is a propulsion system that propels the fire tarpaulin to the chemical combustion reaction. The aircraft is a vehicle used: a) as a launching platform to deliver the fire tarpaulin to the chemical combustion reaction; and, b) a vehicle to subsequently recover the fire tarpaulin for future use.

Abstract: A polyhedron that approximates a sphere made up of generally irregular polygons.