In this episode we want to introduce you to another show made at VPR that we think you're really going to like. It's called Timeline and it explores the history of western music. Host James Stewart has just made 4 special episodes exploring the elements fire, water, earth and air. We're bringing you the water episode!

'But Why' heads to the farm to answer a whole herd of animal questions: How do cows make milk? Why do cows moo? Why do some animals eat grass? Why do pigs have curly tails? Why do pigs have more teats than cows? Why do eggs in the fridge not hatch? How do chicks grow in their eggs? Why do roosters crow? Why do horses have hooves? Why do horses stand up when they sleep? Why are some fences electric?

Why do ants bite? Do both male and female ants have stingers? Do ants sleep? What do they do in the winter? In this episode we learn all about the fascinating world of ants with Brian Fisher , curator of entomology at the California Academy of Sciences. Fisher has identified about 1000 different species of ants!

How fast can the fastest bird go (and what bird is it?) Why do birds have wings? How do they fly? Why are birds so colorful? And why do they sing at dawn and dusk? In the second part of our live show in April with Bird Diva Bridget Butler, we learn all about birds, and get some lessons in how to sing like our avian neighbors!

How do owls eat? Why are owls nocturnal and how do they see in the dark? How do owls swivel their heads all the way around? Why do birds move their heads back and forth when they walk? This episode was recorded live at The Mega Awesome Super Huge Wicked Fun Podcast Playdate in Brookline, Massachusetts.

Why is tape sticky? How do erasers erase? We'll tackle arts and crafts in this episode, answering not just those two questions but learning how to make paint out of rocks and spit!! Vermont artist and wildcrafter Nick Neddo joins us with some tips on how to create your own paint and art supplies.

After hearing our episode about hearts, 3yo Ethan Chandra, from Middlesex, NJ, wanted to share the story of his own heart. In this podcast extra, Ethan and his 5yo sister Zoe and their mother, Ali, talk about what it's been like for Ethan to live with a condition called heterotaxy.

How does your heart keep you alive? How does it pump blood? Why is blood so important? Why do children have heart surgeries? Why is a baby's heartbeat faster before it's born? Why does blood rush to your head when you're upside down? Why can you feel your heart in your head when you're lying still or under water? In this episode of But Why, we're going talking about a very special muscle! It keeps us alive and it has its own special rhythm: the heart. Pediatric oncologist Dr. Jane Crosson from Johns Hopkins Hospital answers questions about the heart.