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latest Mind and Matter column for the Wall Street
Scientists, it's said, behave more like lawyers than
philosophers. They do not so much test their theories as prosecute
their cases, seeking supportive evidence and ignoring data that do
not fit-a failing known as confirmation bias. They then accuse
their opponents of doing the same thing. This is what makes debates
over nature and nurture, dietary fat and climate change so
But just because the prosecutor is biased in favor of his
case does not mean the defendant is innocent. Sometimes biased
advocates are right. An example of this phenomenon is now being
played out in geology over the controversial idea that a meteorite
or comet hit the earth 12,900 years ago and cooled the