The earth has existed for over 4.5 billion years.  It can be tough to grasp that within those 4.5 billion years, humans have only existed for a few hundred thousand of them, a mere moment in time. So how did we, homo sapiens, come to be? Kallie Moore, paleontologist and co-host of the popular PBS YouTube channel Eons, joins the podcast. In this first of two episodes, Kallie walks listeners through the origin of our species from the Great Apes, and shares what knowledge we have on our historical interactions with the now extinct neanderthals.