Fossils, Rocks and Radioactive Clocks: How to date the ancient past

Send us a text Today on the BioAudio podcast, it's all about dating! (no not that kind). Have you ever wondered how we figure out when things happened way in the past? When a scientist says "it's 100 million years old..." just how did they figure it out? Today I'm talking to Dr. Matthew Jones. He's a paleontologist at Arizona State University and his specialty is fossil mammals (though he admits he was a dinosaur kid). It's often his job to figure out just how old is this rock and he's going ...