Kari Byron's time as a co-host on Mythbusters formed the core of her passion for science, but in the years since then she has turned that passion into a calling. She is now an advocate for fostering a love of STEM to younger generations, through her media company, EXPLR and the National STEM Festival which she founded and is expanding from the US to the rest of the world.    Guest: Kari Byron, former co-host of Mythbusters, co-founder of EXPLR Media and director and founder of the US-based National STEM Festival.