Proof in science is elusive. Even more than in the “core” sciences of biology, chemistry and physics, establishing absolute proof in medicine and health is nearly impossible. The primary objective of research investigation is to determine only what is likely to be true. This is because research into health is inherently statistical. When you throw a ball in the air, will it come down? Yes, every time. That’s physics. If you smoke four packs a day, will you get lung cancer? The answer is maybe. We know that your odds of getting lung cancer are much higher than if you didn’t smoke, and we can
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