In September 1492, Columbus’s fleet was sailing in the Atlantic Ocean. At this time, it had been more than a month since they set off from Spain. The crew was very anxious, because Columbus had promised before setting off that it would take less than a month to reach Asia. At this time, the lookout on the fleet’s flagship “Santa Maria” suddenly told everyone that a large “grassland” appeared ahead! Excited, Columbus ordered the fleet to advance at full speed. However, when the fleet came close to the “grassland”, everyone realized that it was not a “grassland”, but pieces of green seaweed floating on the ocean, which gave off a…