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As a marketing technique, the free sample has a long and effective history. In most instances, a small amount of the relevant product is provided to potential customers for the stated purpose of allowing them to try it to see if they like it.

In our messy, flawed lives, the nearest we can get to truth is consistency. Consistency is the bedrock of the scientific method. Scientists creep up on the truth by performing controlled experiments and attempting to observe consistent results. In your everyday, nonscientist life you do the same thing, but it's not as impressive, nor as reliable. For example, if every time you eat popcorn, one hour later you fart so hard that it inflates your socks, you can reasonably assume popcorn makes you gassy. It's not science, but it's still an entirely useful pattern. Consistency is the best marker of truth that we have, imperfect though it may be.