Shell shock is basically PTSD and it was thought to be caused by soldiers being exposed to explodeing shells
Answer:
Zheng He , Marco Polo and Christopher Columbus
Explanation:
Zheng He - was a Chinese explorer who sailed along the Southeast Asian, South Asian, Western Asian, and East African coasts along with his fleet of incredibly large ships and several hundred men (1405–33).
Marco Polo - was an Italian explorer who traveled to the far east and back to his hometown Venice in the matter of 24 years. He is noted for making detailed chronicles of his travels (1271–95).
Christopher Columbus - Famous Italian explorer and possibly the best-known explorer that ever lived. Known for "discovering" America (1492).
