T-Rex Soft Tissue Controversy Explained? How Iron Preserved 68-Million-Year-Old Dinosaur Tissue 'Like Formaldehyde'

When scientists claimed in 2005 they'd recovered soft tissue from a 68-million-year-old Tyrannosaurus rex fossil found in Montana, skeptics jumped at the opportunity to cry foul. How exactly could soft tissue survive millions of years underground without decaying? They challenged.