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.
The World Health Organisation estimates that 725,000 people are killed each year by mosquito-born diseases. A staggering 200 million people are at least temporarily incapacitated by malaria alone, of which 600,000 die. Dengue fever, yellow fever and encephalitis are also deadly diseases carried by mosquitoes.