Inca Rope bridges were simple suspension bridges over canyons and gorges to present access for the Inca Empire. Bridges of this type were suitable for use since the Inca people did not use wheeled transport - traffic was incomplete to pedestrians and livestock. These bridges were an intrinsic part on the Inca road scheme and are an excellent example of Inca innovation in engineering. They were frequently used by Chasqui runners delivering messages throughout the Inca Empire.

The construction of these bridges amounted to a pair of stone anchors on each side of the canyon with immense cables of woven ichu grass linking these two pylons together. Adding to this construction, two additional cables acted as guardrails. The cables which supported the foot-path were unbreakable with plaited branches. This multi-structure system made these bridges strong enough to even carry the Spaniards while riding horses after they indoors. However, these massive bridges were so heavy that they tended to sag in the middle, and this caused them to bend in high winds.

Hardware is a general term that refers to the physical artifacts of a technology. It may also mean the physical components of a computer system.

Hardware historically meant the metal parts and fittings that were used to make wooden products stronger, more functional, longer lasting and easier to fabricate or assemble. In modern usage it includes equipment such as keys, locks, hinges, latches, corners, handles, wire, chains, plumbing supplies, tools, utensils, cutlery and machine parts, especially when they are made of metal. In the United States, this type of hardware has been traditionally sold in hardware stores, a term also used to a lesser extent in the UK.

In the electronics and especially computer industries, computer hardware specifically means the physical or tangible parts of the equipment, such as circuit boards, keyboards, monitors etc., in contrast to non-physical software running on the computer or other device.

In a more colloquial sense, hardware can refer to major items of military equipment, such as tanks, aircraft or ships.

Clothing protects the vulnerable nude human body from the extremes of weather, other features of our situation, and for safety reasons. Every article of clothing also carries a enriching and social meaning. Human beings are the only creatures known to wear clothing, with the exemption of pets clothed by their owners. People also decorate their bodies with makeup or foundation, perfume, and other ornamentation; they also cut, dye, and organize the hair of their heads, faces, and bodies, and sometimes also mark their skin. All these streamers contribute to the overall effect and message of clothing, but do not constitute clothing per se.

Articles carried rather than worn are normally counted as fashion garnishing rather than as clothing. Jewelry and eyeglasses are usually counted as accessories as well, even though in general speech these items are described as being worn rather than carried. The practical function of clothing is to protect the human body from dangers in the surroundings: weather, insects, noxious chemicals, weapons, and get in touch with with abrasive substances, and other hazards. Clothing can protect against many things that might injure the naked human body. In some cases clothing protects the environment from the clothing wearer as fine.

Humans have shown intense inventiveness in devising clothing solutions to practical problems and the difference between clothing and other protective equipment is not always clear-cut. See, among others: air inured clothing, armor, diving suit, swimsuit, bee-keeper's uniform, motorcycle leathers, high-visibility garments, and protective clothing.

In tennis, grass is grown on very hard-packed soil, and bounces may vary depend on how healthy the grass is, how recently it has been mowed, and the wear and tear of recent play. The most famous grass tennis court in the world is Centre Court at Wimbledon. Tennis, however, is generally played on clay courts, and only a a small number of regular tennis tournaments are played on a grass court. The exterior is less firm than rigid courts, causing the ball to spring back lower, and so players must reach the ball quicker. Due to high maintenance costs however, grass courts are now rare as they must be watered and mowed often, and take a longer time to dry after rain than hard courts.

A Trailer is normally an unpowered vehicle pulled by a powered vehicle, because powered trailers are more explicitly called potrailers. Commonly, the term trailer refers to such vehicles used for transport of goods and materials.

Trailer winches are intended to load (or unload) boats and other cargo to and from a trailer. The are invented  a ratchet mechanism and cable. The handle on the ratchet mechanism is twisted to tighten or loosen the tension on the winch cable. There are both manual and motorized trailer winches. Popup campers are trivial, aerodynamic trailers that can be towed by a small car, such as the BMW Air Camper and the Coleman Bayside. They are built to be shorter than the tow vehicle, minimizing drag.

Others range from two-axle campers that can be pulled by most mid-sized pickups to trailers that are as long as the host country's law allows for drivers without individual permits. Larger campers tend to be fully integrated leisure vehicles, which often are used to tow single-axle dolly trailers to allow the driver to bring small cars on their travels.

A university is an institution of higher education and research, which grants academic degrees at all, levels bachelor, master, and doctorate in a variety of subjects. A university provides both tertiary and quaternary education. The word university is derived from the Latin universitas magistrorum, scholarium, roughly meaning community of masters and scholars. Because of the above definition, there is some controversy regarding which is the world oldest university. If we consider a university as a corporation of students, then Plato's Academy is the first historically documented university. The original Latin word "universitas", first used at the time of renewed interest in Classical Greek and Roman tradition, tried to reflect this feature of Academy. If we consider university simply as a higher education institution, then it could be Shangyang, which was founded before the 21st c. BC in China, if it is not a just myth. In the western world, the choice is between Takshashila, Nalanda, Ratnagiri University and Al-Azhar University.  

The term race describes populations or groups of people well-known by different sets of characteristics, and beliefs about common ancestry. The most broadly used human racial categories are based on visible traits, and self-identification. Conceptions of race, as well as specific ways of grouping races, vary by culture and over time, and are often contentious for scientific as well as social and political reasons. Many scientists contend that while the features on which a racial categorization are made may be based on genetic factors, the idea of race itself, and actual divisions of persons into groups based on selected hereditary features, are social constructs. Since the 1940s, some evolutionary scientists have rejected the view of race as a biologically meaningful impression. A majority of evolutionary scientists reject the notion that any definition of race pertaining to humans can have any taxonomic rigour and validity. Mainstream scientists have argued that race definition are imprecise, arbitrary, derived from custom, have many exceptions, have many gradations, and that the numbers of races experimental vary according to the culture examined. They further preserve that race as such is best understood as a social construct.

An inductor is a passive electrical device working in electrical circuits for its property of inductance. Inductance is an consequence which results from the magnetic field that forms around a current carrying conductor. Electrical current through the conductor creates a magnetic flux relative to the current. A change in this current creates a change in magnetic flux that, in turn, generates an electromotive force that acts to oppose this change in current. Inductance is a calculate of the generated emf for a unit modify in current. An inductor with an inductance of 1 henry produces an emf of 1 V when the current through the inductor changes at the rate of 1 ampere per second. The number of turns, the area of each loop/turn, and what it is wrapped around influence the inductance. An inductor opposes changes in the current. An ideal inductor would offer no resistance to a constant direct current, however, only superconducting inductors have truly zero electrical resistance. Inductors are used expansively in analog circuits and signal processing.

Populations are studied, in exacting, in a branch of ecology known as population biology, and in population genetics. In population dynamics, size, age and sex structure, mortality, reproductive behavior, and development of a population are studied. In biology, an isolated population denotes a breeding group whose members breed mostly or solely among themselves, usually as a result of physical isolation, although biologically they could breed with any members of the varieties. If there are several completely or nearly completely secluded populations in the global population of a taxon, these are called subpopulations. The Metapopulation is a network of subpopulations in a given area, where the individuals of the various subpopulations are able to cross dilapidated areas of the region. Biological dispersal is one of the key elements upsetting such populations; if dispersal is sufficiently low for a prolonged period of time, speciation is likely to be a consequence. Population growth is varying in population over time. It also can be quantified as the change in the number of individuals in a population per piece time. The term population growth can technically refer to any species, but almost always refers to humans, and it often used easily for the more specific demographic term population growth rate, and is often used to refer specifically to the expansion of the population of the world.

A computer is a display device. A computer programming utility used for examining and modifying memory-resident engine code programs. The computer programming interface for synchronising concurrent access to a set of variables in a computer program. A hardware device that events electrical events such as pulses or voltage levels in a digital computer. A speaker used on stage to allow musicians to hear each other. Also called fold back a video monitor, a television-like device used in studio, lab or analysis environments. A supervisory control system for installations such as SCADA to monitor significant system parameters. Special installations require adapted monitoring installations like transformer monitors or substation monitors. A Hall monitor, one who patrols the entry of a school. A Prefect, schoolboy or schoolgirl given individual authority in some British schools, especially public schools.