What is the modern name of the ancient kingdom of Sheba, which was located in what is now known as the Arabian Peninsula?

What were the negative consequences of the introduction of the steel plow in world history?

What are the key provisions of the Hatch Act and how has it impacted the involvement of federal employees in American politics?

What is the nature of the location described by “flakes of bricks” in World History: mechanical or chemical?

What is the geographic relationship between Australia and Asia?

What changes in European culture and society led to the construction of megaliths during the Neolithic period?