Peach fuzz. Chin hairs. Mammalian ponytails. WHY DO THEY HAPPEN. Yale researcher and associate professor Dr. Valerie Horsley stops by California to chat with Alie about the nature of hair and what it has to do with skin and nails, stem cells, how it grows, why some of us have curly hair or straight hair or thin hair or thick hair, and why we love and hate and need our hair as animals.Dr. Valerie Horsely is on FacebookThe Horsely Lab at YaleFull-length (*not* G-rated) Trichology episode + tons of science linksMore kid-friendly Smologies episodes!Become a patron of Ologies for as little as a buck a monthOlogiesMerch.com has hats, shirts, hoodies, totes!Follow @Ologies on X and InstagramFollow @AlieWard on X and InstagramSound editing by Mercedes Maitland of Maitland Audio Productions and Steven Ray MorrisMade possible by work from Noel Dilworth, Susan Hale, Kelly R. Dwyer & Erin TalbertSmologies theme song by Harold Malcolm