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2. Impossible cube - Wikipedia

   en.wikipedia.org/wiki/Impossible_cube

   Impossible cube. Viewed from a certain angle, this cube appears to defy the laws of geometry. The impossible cube or irrational cube is an impossible object invented by M.C. Escher for his print Belvedere. It is a two-dimensional figure that superficially resembles a perspective drawing of a three-dimensional cube, with its features drawn ...

3. Pykrete - Wikipedia

   en.wikipedia.org/wiki/Pykrete

   Pykrete. A slab of pykrete. Pykrete is made of 14% sawdust and 86% water by mass. Pykrete (/ ˈpaɪkriːt /, PIE-creet) [1] is a frozen ice composite, [2] originally made of approximately 14% sawdust or some other form of wood pulp (such as paper) and 86% ice by weight (6 to 1 by weight). During World War II, Geoffrey Pyke proposed it as a ...

4. Surface-area-to-volume ratio - Wikipedia

   en.wikipedia.org/wiki/Surface-area-to-volume_ratio

   The surface-area-to-volume ratio has physical dimension inverse length (L −1) and is therefore expressed in units of inverse metre (m -1) or its prefixed unit multiples and submultiples. As an example, a cube with sides of length 1 cm will have a surface area of 6 cm 2 and a volume of 1 cm 3. The surface to volume ratio for this cube is thus.

5. Intermodal container - Wikipedia

   en.wikipedia.org/wiki/Intermodal_container

   Intermodal container. A 40-foot-long (12.2 m) shipping container. Each of its eight corners has an essential corner casting for hoisting, stacking, and securing. Containers stacked on a large ship. An intermodal container, often called a shipping container, or cargo container, (or simply “container”) is a large metal crate designed and ...

6. Hoffman's packing puzzle - Wikipedia

   en.wikipedia.org/wiki/Hoffman's_packing_puzzle

   Hoffman's packing puzzle is an assembly puzzle named after Dean G. Hoffman, who described it in 1978. [1] The puzzle consists of 27 identical rectangular cuboids, each of whose edges have three different lengths. Its goal is to assemble them all to fit within a cube whose edge length is the sum of the three lengths. [2] [3]

7. Woodchips - Wikipedia

   en.wikipedia.org/wiki/Woodchips

   Woodchips, with hand for scale. Woodchips are small- to medium-sized pieces of wood formed by cutting or chipping larger pieces of wood such as trees, branches, logging residues, stumps, roots, and wood waste. [1][2] Woodchips may be used as a biomass solid fuel and are raw material for producing wood pulp. [3]