A garden tool is any one of many tools made for gardening and landscaping, which overlap with the range of tools made for agriculture and horticulture. Garden tools can be divided into hand tools and power tools. Today's garden tools originated with the earliest agricultural implements used by humans. Examples include the hatchet, axe, sickle, scythe, pitchfork, spade, shovel, trowel, hoe, fork, and rake. In some places, the machete is common. The earliest tools were made variously of wood, flint, metal, tin, and bone. The development of metalworking, first in copper and later in bronze, iron, and steel, produced today's durable tools, including such efficient cutting tools as pruning shears (secateurs – for example anvil pruners),grass shears, and loppers.Increasing use of modern alloys allows many tools to be made both stronger and lighter, making them more durable and easier to use. Some modern tool designs reflect ergonomic considerations, being designed to induce less stress on the human body in use. The most efficient tools keep the body in a neutral position to help reduce the stress on joints and muscles, which also require less energy to use.