As just about every statistics student can attest, Simpson's Paradox — a statistical phenomenon where an apparent trend is reversed when you look at subgroups — is notoriously hard to explain. You can look at examples — say, the fact that US wages are rising overall, but dropping within every educational group — but that don't really help to explain the paradox. But it's not really paradox at all, but simply the fact that the disparate rate at which members of the study join the subgroups isn't accounted for in the analysis. To demonstrate this effect, the Visualizing Urban Data...
“When we worry too much about protecting privacy, we risk losing the benefits of publicness that the internet brings us. Ill argue that we, the public, must protect whats public.”
With billions of planets capable of supporting intelligent life, why no visits to earth? This is "The Fermi Paradox." Any civilization, with modest rocket tech & immodest funds, could rapidly colonize the Milky Way...
F. Kooti, N. Hodas, and K. Lerman. Proceedings of the eighth International AAAI Conference on Weblogs and Social Media, page 266--274. AAAI, AAAI Press, (June 2014)