It was the ancient Greeks who first developed the passive solar concepts that the Romans adopted, but the Romans used their engineering and design skills to improve the technique. Passive-solar buildings are built based on the orientation of the sun's path and use the sun's rays to heat the interiors.
World leaders can go by many titles: premier, chancellor, dear respected comrade. But two of the most common are president and prime minister. What differentiates them other than the latter’s hint of continental flavor?
