![International Skeptics United show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/023/655/small/international-skeptics-united.jpg)
Summary: This week, why we're passengers in our own bodies, outnumbered by our resident bacteria. We explore how these bugs can alter your brain and behaviour, and "trans-poo-sion": the poo-transplant process that might save your life! Plus, why the chances of ET existing have rocketed this week, and signs that birds count the same way we do...