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Super happy to answer any questions you might have along the way. 
I volunteer as tribute! (For sound design AMA) I also don’t know what a fresnel is.
In VFX terms, Fresnel refers to the relationship between the angle you look at a surface and the amount of coloration or reflectivity you see. When added on to an object, you get the above effect! http://kylehalladay.com/blog/tutorial/2014/02/18/Fresnel-Shaders-From-The-Ground-Up.html …pic.twitter.com/6QPJSQE6K3
TLDR - it makes the edge shiny!
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