Keeping the faith For the last 20 years, Mary Schweitzer, a paleontologist at North Carolina State University in Raleigh, has amassed a wealth of evidence that she’s isolated protein fragments from dinosaurs as much as 80 million years old. That bucks the conventional wisdom among paleontologists who argue that proteins, which are made of chains of amino acids, can’t survive more than 1 million years or so. So far, no group other than Schweitzer and her collaborators has managed to…