Scientists Found a 444-Million-Year-Old Inside-Out Fossil With Its Guts Perfectly Intact
created: April 15, 2025, 6 p.m. | updated: April 22, 2025, 1:22 p.m.
<p>For years, a mysterious fossil specimen defied categorization, until one paleontologist made a surprising discovery.</p>
8 months, 1 week ago: Latest Content - Popular Mechanics