1. Ramses III ruled Egypt for 31 years and is widely considering the last of the great pharaohs.

2. A single gram of forest soil can contain as many as a billion bacterial.

3. The Great Depression of the late 1920s remains the longest and more severe economic downturn in modern history.

4. In the early 19th century, animals were the chiefly source of power in farming.

5. Evidence of urban planning can be found in the ruins of ancient cities, including orderliness street systems and conduits for water and sewage.