Don’t mistake an assumption for a fact

The Logic of Science

Carl Sagan quote extraordinary evidence claimsI want you to imagine for a minute that you have been selected for jury duty, and you are sitting in the courtroom listening to the evidence. As you watch, the prosecution calls an expert forensic scientist to the stand, and they carefully explain the facts concerning the forensic evidence, all of which point towards the defendant’s guilt. Then, the defendant’s lawyer stands up and shouts, “Objection, this witness has been paid off to lie about my client!” After a moment of shocked silence, the judge says, “That is quite a claim. What evidence do you have to support it?” The lawyer then responds simply by saying, “only someone who had been bought off would say things like that against my client.” Now, what do you think is going to happen next? Is that a reasonable defense that the judge will accept? Obviously not! The defense is making an extraordinary…

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