In 2003, an exceptionally well preserved T. rex leg bone was unearthed in the Cretaceous rocks of Montana. Upon close examination, Dr. Mary Schweitzer found the bone to contain soft tissue inside - tiny blood vessels and proteins! Some claim that this is evidence of a young Earth, a recent extinction of the dinosaurs. Could this be, or is there another explanation?

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Update: since writing the script for this video, a study came out further questioning that the tissue found belongs to the original T. rex, suggesting again that it is biofilm: http://rspb.royalsocietypublishing.or...

Even more recently, a study published in Nature came out further confirming that the tissue did belong to T. rex and detailed, with much greater clarity than before, how the preservation happens: https://www.nature.com/articles/s4159...

In short, scientific consensus is no longer as strong as suggested in this animation, the boat was rocked again, but it looks like it's on its way to being settled once again on the position that the soft tissue is indeed from the original T. rex.
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Papers cited in this animation:

ORIGINAL DISCOVERY OF SOFT TISSUE:
Soft Tissue Vessels and Cellular Preservation in Tyrannosaurus rex: http://science.sciencemag.org/content...

Soft tissue and cellular preservation in vertebrate skeletal elements from the Cretaceous to the present: https://www.ncbi.nlm.nih.gov/pmc/arti...

CRITIQUE OF DISCOVERY:
Dinosaurian Soft Tissues Interpreted as Bacterial Biofilms: https://www.ncbi.nlm.nih.gov/pmc/arti...

DEFENSES OF DISCOVERY:
Influence of Microbial Biofilms on the Preservation of Primary Soft Tissue in Fossil and Extant Archosaurs:
https://www.ncbi.nlm.nih.gov/pmc/arti...

Molecular analyses of dinosaur osteocytes support the presence of endogenous molecules: http://www.thebonejournal.com/article...

Testing the Hypothesis of Biofilm as a Source for Soft Tissue and Cell-Like Structures Preserved in Dinosaur Bone: https://www.ncbi.nlm.nih.gov/pmc/arti...

10 million year old frog bones with marrow preserved: https://pubs.geoscienceworld.org/geol...

IRON’S ROLE IN PRESERVATION:
A role for iron and oxygen chemistry in preserving soft tissues, cells and molecules from deep time: http://rspb.royalsocietypublishing.or...

OTHER DINOSAURS WITH SOFT TISSUE DISCOVERED:
Mass Spectrometry and Antibody-Based Characterization of Blood Vessels from Brachylophosaurus canadensis: https://www.ncbi.nlm.nih.gov/pmc/arti...

Evidence of preserved collagen in an Early Jurassic sauropodomorph dinosaur revealed by synchrotron FTIR microspectroscopy: https://www.ncbi.nlm.nih.gov/pmc/arti...

Soft sheets of fibrillar bone from a fossil of the supraorbital horn of the dinosaur Triceratops horridus: https://www.ncbi.nlm.nih.gov/pubmed/2...

Hemoglobin-derived porphyrins preserved in a Middle Eocene blood-engorged mosquito: https://www.ncbi.nlm.nih.gov/pubmed/2...

Molecular preservation in Late Cretaceous sauropod dinosaur eggshells https://www.ncbi.nlm.nih.gov/pmc/arti...