Tools

A tool or device is a piece of equipment which typically provides a mechanical advantage in accomplishing a physical task. The most basic tools are simple machines. For example, a crowbar simply functions as a lever. The further out from the pivot point, the more force is transmitted along the lever. When particularly intended for domestic use, a tool is often called a utensil. Philosophers once thought that only humans used tools, and often defined humans as tool-using animals. But observation has confirmed that Tool-using species, including monkeys, apes, several corvids, sea otters, and others. Later, philosophers thought that only humans had the ability to make tools, until zoologists observed birds and monkeys making tools.Some tools can also serve as weapons, such as a hammer or a knife. Similarly, people can use weapons, such as explosives, as tools. 

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