I was on wiki reading about the six degrees of separation theory set out by Hungarian author Frigyes Karinthy. He had posited this theory in his collection of short stories called Everything is different. This is from an excerpt from the book which describes the theory.
A fascinating game grew out of this discussion. One of us suggested performing the following experiment to prove that the population of the Earth is closer together now than they have ever been before. We should select any person from the 1.5 billion inhabitants of the Earth – anyone, anywhere at all. He bet us that, using no more than five individuals, one of whom is a personal acquaintance, he could contact the selected individual using nothing except the network of personal acquaintances.
It just hit me. This was in the year 1929. In the past 87 years alone, our population count has increased from an enough 1.5 billion to a colossal and frightening 7 billion (as realised in year 2012), and counting.
That’s fucked up. And the theory doesn’t serve sense anymore.
On a related note, the earth has gone through 5 major extinction epochs in the past. The sixth one called 'Holocene extinction' is going on, in which 10,000 to 100,000 species are going extinct every year. Check out the first entry in the image below.