"To a layperson, this ebb and flow of scientific opinion, the flipflop of theory over time, the occasionally fierce and public disagreements between viewpoints, is as mystifying as it is frustrating… This isn’t a sign of science’s weakness, though, but rather its strength, always testing assumptions, making challenges, drawing new conclusions based on the latest evidence. It may err too far in one direction, then too far in the other, correcting as it goes, but every step eventually brings us all a little closer to the truth."