James Lovelock says humanity is "Earth's infection." Nice. We are the viruses. ... Lovelock's thinking is that our increasing presence is getting things so out of whack that, in the manner of a human immune system, the planet has no choice but to respond.
Barry Marshall changed the face of medical science when he swallowed a petri-dish of dangerous bacteria to prove it caused stomach ulcers. His theory meant that they could be treated with a simple anti-biotic rather than expensive surgery. Dr Marshall also claimed that his research continues to save up to 500,000 lives per year.