Stone Age - refers to the period when humans began to use stone tools, for hunting wild animals for for meat and gathered food, firewood, and materials for their tools, clothes, or shelters., Black smith - a craftsperson who shapes metal into objects using tools like hammers and anvils. They work with iron and steel, heating the metal until it's soft enough to bend and shape. were essential to the society of the 19th century., Steam engine - a machine that uses heat and steam pressure to create mechanical motion. which was a period of rapid industrial and manufacturing growth in the late 18th and early 19th centuries., Cellular Phone - also known as a mobile phone, is a portable device that allows users to communicate over radio waves. It can be used to make calls, and send texts messages. was invented by Martin Cooper in late 20th century., Robotics - is the interdisciplinary study and practice of the design, construction, operation, and use of robots.,

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