A last is a form in the approximate shape of a human foot, used by shoemakers and cordwainers in the manufacture and repair of shoes. Lasts typically come in pairs, and throughout their history have been made from many materials, including hardwoods, cast iron, and, more recently, high density plastics.

Lasts are made to varying degrees in the shape of the human foot, depending on their specific purpose. They come in many styles and sizes, depending on the exact job they are designed for. They range from simple one-size lasts used for repairing soles and heels, to hard-wearing lasts used in modern mass production, and to custom-made lasts used in the making of bespoke footwear.

Historically, lasts were made from a number of materials - typically hardwoods and cast iron. These are materials that will retain their shape, even when in contact with wet materials, like leather, being stretched and shaped.

The material used to make modern lasts must be strong enough to withstand the forces of mass production machinery, such as that applied by the pullover machines when bottoming the shoe, and must also be able to hold tacks (known as "lasting tacks") which are used to hold shoe parts together temporarily before the sole is added. Although hardwoods satisfy these criteria, modern lasts, especially those used by mass production factories in places such as China, are often made from high-density polyethylene plastic (HMW-HDPE), which allows for many tack holes before needing repair. Such plastics also have the benefit that they can be recycled and remoulded when they wear out.

Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future. Time is a component quantity of many measurements used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience. The temporal position of events with respect to the transitory present is continually changing; events happen, then are located further and further in the past. Time has been a major subject of religion, philosophy, and science, but defining it in a manner applicable to all fields of study without circularity has consistently eluded scholars. A simple definition states that "time is what clocks measure".

Time is one of the seven fundamental physical quantities in the International System of Units. Time is used to define other quantities — such as velocity — so defining time in terms of such quantities would result in circularity of definition. An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called spacetime bring questions about space into questions about time, questions that have their roots in the works of early students of natural philosophy.

Data ( /ˈdeɪtə/ DAY-tə, /ˈdætə/ DA-tə, or /ˈdɑːtə/ DAH-tə) are values of qualitative or quantitative variables, belonging to a set of items. Data in computing (or data processing) are often represented by a combination of items organized in rows and multiple variables organized in columns. Data are typically the results of measurements and can be visualised using graphs or images. Data as an abstract concept can be viewed as the lowest level of abstraction from which information and then knowledge are derived. Raw data, i.e., unprocessed data, refers to a collection of numbers, characters and is a relative term; data processing commonly occurs by stages, and the "processed data" from one stage may be considered the "raw data" of the next. Field data refers to raw data collected in an uncontrolled in situ environment. Experimental data refers to data generated within the context of a scientific investigation by observation and recording.

The word data is the plural of datum, neuter past participle of the Latin dare, "to give", hence "something given". In discussions of problems in geometry, mathematics, engineering, and so on, the terms givens and data are used interchangeably. Such usage is the origin of data as a concept in computer science or data processing: data are numbers, words, images, etc., accepted as they stand.