Students learn that the small intestine is divided into three parts. The first segment is the duodenum, the second segment is the jejunum, and the third segment is the ileum. The duodenum receives digestive enzymes from the pancreas and bile from the gallbladder. These substances aid digestion by breaking down certain food particles. Most absorption […]

Students learn that until the nineteenth century, ocean floors were considered flat, featureless plains. Early attempts to map the ocean floors used soundings taken with weighted lines from ships. This method was slow and inaccurate. In 1855, U.S. Navy lieutenant Matthew Maury published a bathymetric chart, which indicated that an underwater mountain existed in the middle […]