This is the Deadliest Disease in Human History

There are some pretty terrifying diseases out there, but many people don't realise that the most deadly isn't Ebola or a viral flu strain - it's malaria.

As the Business Insider video below explains, for around 20 million years, the parasite that causes malaria has been plaguing humans and our ancestors. The mosquito-borne disease halted the armies of Genghis Khan and Attila the Hun in their tracks, and infected George Washington, Theodore Roosevelt, Abraham Lincoln, and John F Kennedy.