
publisher
Smithsonian Magazineauthors
Smithsonian Magazine, Brigit Katz, Read More, Brigit Katz Is A Freelance Writer Based In Toronto. Her Work Has Appeared In A Number Of Publications, Including Nymag.Com, Flavorwire, Tina Brown Media'S Women In The World.
summary
Researchers say prehistoric mastodon bones bear human-made markings