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A tool is an object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task.

Although many animals use simple tools, only human beings, whose use of stone tools dates back hundreds of millennia, have been observed using tools to make other tools.

Productivity is the efficiency of production of goods or services expressed by some measure.

Measurements of productivity are often expressed as a ratio of an aggregate output to a single input or an aggregate input used in a production process, i.e. output per unit of input, typically over a specific period of time.

The most common example is the (aggregate) labour productivity measure, one example of which is GDP per worker.

There are many different definitions of productivity (including those that are not defined as ratios of output to input) and the choice among them depends on the purpose of the productivity measurement and data availability.

The key source of difference between various productivity measures is also usually related (directly or indirectly) to how the outputs and the inputs are aggregated to obtain such a ratio-type measure of productivity.

Writing is the act of creating a persistent representation of human language.

A writing system uses a set of symbols and rules to encode aspects of spoken language, such as its lexicon and syntax.

However, written language may take on characteristics distinct from those of any spoken language.

The ampere (symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI).

One ampere is equal to 1 coulomb (C) moving past a point in 1 second.

It is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism along with Danish physicist Hans Christian Ørsted.

In electricity generation, a generator is a device that converts motion-based power (potential and kinetic energy) or fuel-based power (chemical energy) into electric power for use in an external circuit.

Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines, wind turbines and even hand cranks.

The first electromagnetic generator, the Faraday disk, was invented in 1831 by British scientist Michael Faraday.

Generators provide nearly all the power for electrical grids.