Scientists think they've found ancient remnants of dinosaur blood

Scientists think they've found ancient remnants of dinosaur blood Download Embed < iframe src="https://www.npr.org/player/embed/nx-s1-6026704/nx-s1-9997817" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player"> Scientists have studied plenty of dinosaur bones, eggs and footprints.

Now, some think they've found their strongest evidence yet of dinosaur blood.