Folding & Unfolding 

Ia  Linkages a: Universality  
Ib  Linkages b: Pantographs & Popups  
Ic  Linkages c: Locked Chains  
Id  Paper d: Protein Folding  
Ie  Linkages e: UnitLength Locked Chains?  
IIa  Paper a: Flat Origami  
IIb  Paper b: OneCut Theorem  
IIc  Image Source 
Paper c: Skeletons, Roofs and the Medial Axis 
IId  Paper d: Medial Axis Models  
IIIa 

Polyhedra a: Folding Polygons 
IIIb  Polyhedra b: Unfolding  
IIIc  Polyhedra c: Cauchy's Rigidity Theorem  
IIId  Polyhedra d: Alexandrov to Sabitov  