brass (about 4,000 BCE). The first use of iron alloys such as steel dates to around 1,800 BCE.

Ancient

After harnessing fire, humans discovered other forms of energy. The earliest known use of wind power is the sailing ship; the earliest record of a ship under sail is that of a Nile boat dating to around 7,000 BCE. From prehistoric times, Egyptians likely used the power of the annual flooding of the Nile to irrigate

1.Previous
3.Next