1 In 1990, Barack Obama was elected as the first black president of the Harvard Law Review. 2  Obama, who graduated from HLS in 1991, would later represent Illinois in the U.S Senate, and in 2008 would become the 44 th President of the United States, and the first African-American president.
Most cancers in the lung are carcinomas-cancers of epithelial cells. The top pair of images shows the normal epithelium of the bronchi. This photomicrograph is greatly enlarged. The next three pairs of images show three successive stages of abnormal changes in the bronchial epithelium commonly found in smokers.
The lungs are contained within a space called the pleural cavity, and when an excess of fluid is in the pleural cavity, it is called a pleural effusion. Pleural effusion can make breathing difficult and uncomfortable, and when cancer cells are in the fluid, it is called malignant pleural effusion.