2nd-millennium BC introductions

thumb|upright=0.55|Swiss longsword, 15th or 16th century

Steel is an alloy of iron and carbon that demonstrates improved mechanical properties compared to the pure form of iron. Due to its high elastic modulus, yield strength, fracture strength and low raw material cost, steel is one of the most commonly manufactured materials in the world. Steel is used in structures (as concrete reinforcing rods or steel beams), in bridges, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons.

thumb|right|300px|(Center) Jet d'eau, (Geneva, Switzerland) Clockwise from top right (1) Fontana di Trevi (Rome) (2) Place de la Concorde (Paris) (3) Fountain in the Garden of Versailles (Versailles) (4) The Hundred Fountains, Villa d'Este (Tivoli, Italy) (5) Fuente de los Leones, (The Alhambra, Granada) (6) Fountain in St. Peter's Square (Rome) (7) Samson and the Lion fountain (Peterhof, St. Petersburg, Russia) (8) Dubai Fountain (Dubai)

toy designed to spin rapidly on the ground, the motion of which causes it to remain precisely balanced on its tip because of its rotational inertia

thumb|250px|Reconstructed Roman chariot drawn by horses. thumb|250px|Approximate historical map of the spread of the spoke-wheeled chariot, 2000—500 BC

thumb|Flip flops on feet being worn Flip-flops (or thongs in Australian English) are a type of light sandal-like shoe, typically worn as a form of casual footwear. They consist of a flat sole held loosely on the foot by a Y-shaped strap known as a toe thong that passes between the first and second toes and around both sides of the foot. This style of footwear has been worn by people of many cultures throughout the world, originating as early as the ancient Egyptians in 1500 BC. In the United States the modern flip-flop may have had its design taken from the traditional Japanese zōri after Worl

ancient syllabary for Mycenaean Greek used ca. 1400 BCE – 1200 BCE

undeciphered writing system from Crete

ruling title used by certain historical monarchs

chemical compound

A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. thumb|right|A spoked wheel on display at the National Museum of Iran, in [[Tehran. The wheel is dated to the late 2nd millennium BCE and was excavated at Choqa Zanbil.]] thumb|right|The remains of a pair of cart wheels with metal axle assembly. thumb|right|An ox-wagon in [[Aliwal North, South Africa. Note the three missing spokes and the metal tire.]] right|thumb|Wooden spoke wheel with metal rim from antique truck on display in Under

luna

Semantic title used by certain historical monarchs

tombs where deceased are buried with their chariot