|Collage by Lani, texture from FlyPaper Textures.|
The first one is pretty cool, and simple. It's the research of Stephen W. Porges on the vagus nerve. Really awesome material available out there in the virtual world. Here's one little article to whet your apatite:
Another source of stress busting material is the research of Shawn Achor and here's a fun, informative, entertaining, stress busting Ted Talk for you.
Have fun and may your stress be busted!