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Then demonstrate how a truth can be relevant, yet misleading.

A truth can suggest a false previous condition, by stating a mundane event as though it were surprising or unusual. In such a case, the content of the statement itself may be factuall, even if the intended implications of the statement are not. As an example, "All biologists agree that evolution is an unproven theory" suggests that there are other theories that are proven, even though by definition theories can never be proven. The context is correct, however the implication -- by singling out evolution as an "unproven theory" -- is that the theory is somehow less established or credible than other scientific theories.

Moreover, as I have already pointed out, the content of the sticker is factually incorrect. Thus, not only is the sticker misleaning in implication, it is also false in fact.