Can science fix its own mistakes?

Carl Zimmer authored an essay in Sunday's New York Times on whether science "can fix its own mistakes." He quotes the late Carl Sagan, "Science is a self-correcting process.” Mr. Zimmer cites several examples of research findings that were questioned, but where no efforts were made to replicate the research itself. He concludes, "If the scientific community put more value on replication — by setting aside time, money and journal space — science would do a better job of living up to Carl Sagan’s words."
http://www.nytimes.com/2011/06/26/opinion/sunday/26ideas.html