Microsoft co-founder Bill Gates released a swarm of mosquitoes on an unsuspecting audience at a TED conference in 2009. "There's no reason only poor people should have the experience," the billionaire said, before adding that the mosquitoes were not infectious. Gates was making the compelling point that, even if an issue like malaria doesn't directly affect you, you should still care. At that time, he noted, more money had been invested into researching hair loss drugs because, when it comes to baldness, "rich men are afflicted."

Malaria, meanwhile, is present mostly in poor, tropical areas of the world, where it can be devastating. With this memorable demonstration, Gates won over his listeners by using a number of effective presentation tactics, including a visual aid, a direct interaction with the audience and even humor. "Baldness is a terrible thing," he joked. A year later, he gave another presentation at TED on the future of the world's energy, and he recalled how well the 2009 audience had responded. He even replicated the experiment, this time with fireflies to serve as an example of a "gimmicky solution" to the energy crisis. The audience laughed and, later, gave him a standing ovation. He's no Steve Jobs, but, especially more recently in his career, Gates has won a reputation as a great presenter.