Photo-Illustration: Intelligencer; Photo Getty Images In theory, science is an entirely rational and transparent undertaking. Scientists gather data, form hypotheses, and then collect more data to find out which hypothesis is correct. That’s the idea, anyway. In practice, real-life science is messy and often opaque. Data can be ambiguous. Scientists can be bull-headed. The process of shifting consensus has always been as much about politics and intellectual fashion as about theory and data. Now ...