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Tree of life at the Museo de Arte Popular in Mexico City, by Oscar Soteno. A Tree of Life (Spanish: Árbol de la vida) is a type of Mexican pottery sculpture traditional in central Mexico, especially in the municipality of State of Mexico. Originally the sculptures depicted the Biblical story of creation, as an aid for teaching it to natives in ...
A homopolar motor made with a battery cell and a coiled wire. DIY simple homopolar motor made with a drywall screw, a battery cell, a wire, and a disk magnet. The magnet is on the screw head.
Edward Hitchcock's fold-out paleontological chart in his 1840 Elementary Geology. Although tree-like diagrams have long been used to organise knowledge, and although branching diagrams known as claves ("keys") were omnipresent in eighteenth-century natural history, it appears that the earliest tree diagram of natural order was the 1801 "Arbre botanique" (Botanical Tree) of the French ...
A covalent bond forming H 2 (right) where two hydrogen atoms share the two electrons. A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.