PS_overtwisted_everywhere Every contact manifold can be given a non-fillable contact structure Otto van Koert Klaus Niederkrüger http://dx.doi.org/10.1093/imrn/rnm115 Int. Math. Res. Not. IMRN (2007), no. 23, Art. ID rnm115, 22 pages. 2007 IMRN.jpg
Recently Francisco Presas Mata constructed the first examples of closed contact manifolds of dimension larger than 3 that contain a plastikstufe, and hence are non-fillable. Using contact surgery on his examples we create on every sphere S2n-1, n>1, an exotic contact structure ξ- that allows us to embed a plastikstufe. As a consequence, every closed contact manifold M (with exception of S1) can be converted by taking the connected sum of (M,ξ)# (S2n-1,ξ-) into a contact manifold that is not (semi-positively) fillable.