For decades in the Cândido Godói (CG) municipality in Brazil, there was a strange mystery: The rate of twin births is significantly higher than the surrounding area, and twin births around the world. Studies have put the twin birth rate at 10 percent in one district, which is "significantly higher than the 1.8 percent rate for the state of Rio Grande do Sul as a whole". While intriguing, people have concocted strange explanations for why so many twins are born in the area, from something in the water to strange minerals. Advertisement Advertisement A book by journalist Jorge Camarasa went...