Contradictions abound in other areas too.
Last summer , NASA scientists announced a discovery that rocked the world the first evidence of possible life beyond Earth. A potato-sized meteorite picked up in Antarctica appeared to contain tiny fossils of primitive microbes that once had lived on Mars, they said. But last month, after careful study of the Martian meteorite, a team of researchers from three universities declared the supposed fossils really are only bits of fractured rock crystals. Once again, science appears to have changed its mind a frustrating process that baffles the public and often other scientists as well. Some climate researchers say the Earth is getting hotter, and others say that's only a mirage.