“By 8:45 that evening, it was over.” During the 1800s and 1900s, yellow fever was taking the lives of thousands of Americans each year. The USA sent a team of doctors to find the cause of the dreadful disease. Dr. Jesse Lazear was part of that team, and for his sacrifices and research for yellow fever he deserves the title, most valuable scientist. Dr. Jesse Lazear earns the title most valuable scientist because he gave his life to save others. He was so confident in the mosquito theory he let an infected mosquito bite him even though he knew the risks he would be taking. On page 50 of The Secret of The Yellow Death it says,”Dr. Lazear, who sacrificed his life in the war against Yellow Fever, was given a soldier’s