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There are too many camels in the Bible, out of time and out of place.Camels probably had little or no role in the lives of such early Jewish patriarchs as Abraham, Jacob and Joseph, who lived in the first half of the second millennium B.C., and yet stories about them mention these domesticated pack animals more than 20 times. Genesis 24, for example, tells of Abraham’s servant going by camel on a mission to find a wife for Isaac.These anachronisms are telling evidence that the Bible was written or edited long after the events it narrates and is not always reliable as verifiable history. These camel stories “do not encapsulate memories from the second millennium,” said Noam Mizrahi, an Israeli biblical scholar, “but should be viewed as back-projections from a much later period.”

But success can breed complacency. Modern scientists are doing too much trusting and not enough verifying—to the detriment of the whole of science, and of humanity.

A rule of thumb among biotechnology venture-capitalists is that half of published research cannot be replicated. Even that may be optimistic. Last year researchers at one biotech firm, Amgen, found they could reproduce just six of 53 “landmark” studies in cancer research. Earlier, a group at Bayer, a drug company, managed to repeat just a quarter of 67 similarly important papers. A leading computer scientist frets that three-quarters of papers in his subfield are bunk. In 2000-10 roughly 80,000 patients took part in clinical trials based on research that was later retracted because of mistakes or improprieties.

Science still commands enormous—if sometimes bemused—respect. But its privileged status is founded on the capacity to be right most of the time and to correct its mistakes when it gets things wrong. And it is not as if the universe is short of genuine mysteries to keep generations of scientists hard at work. The false trails laid down by shoddy research are an unforgivable barrier to understanding.