The garbage workers that were on strike.
Many knights were professional warriors who served in the lord's army. ... In return, the lord provided the knight with lodging, food, armor, weapons, horses and money. Peasants, or serfs, farmed the land and provided the vassal or lord with wealth in the form of food and products.
A. Developing a vaccine to prevent Polio. I just took the test :)
Islamic scholars preserved works of art and literature, which inspired Europeans.
The invention of the compass was an early piece of technology that helped explorers know where they were going when they were discovering new lands across the globe.
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