A: The main cause of rapid population growth is when there are more births than there are deaths, which is referred to as a natural increase. Other causes of ... Full Answer >
Spanish flu (1918-1919). The influenza pandemic of 1918-1919 killed more people than the World War I, at somewhere between 20 and 40 million people. It has been cited as the most devastating epidemic in recorded world history. Known as Spanish Flu or La Grippe the influenza of 1918-1920 was a global disaster.
Image caption The Ebola outbreak has killed nearly 5,000 people, the majority of them in Guinea, Liberia and Sierra Leone. The World Health Organization (WHO), set up by the United Nations in 1948, is the world's biggest and most important public health body.