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It takes only one "counterexample" to disprove the theory of an [[Old Earth]].<ref>Most of the "evidence" for an [[Old Earth]] is based on claims that lack testability, as in [[radiometric dating]], and hence would not even satisfy minimum requirements for admissibility in court.</ref> As with any logical proposition, one contradiction disproves the proposed rule. If each of the 25 counterexamples provided here (as of June 28, 2010) has merely a 10% chance of being valid, which is certainly an underestimate{{fact}}, then the probability that the Earth is billions of years old is only 7%. From another perspective, these counterexamples demonstrate that the Earth must be young with 93% probability.