Contact topology, taut immersions, and Hilbert's fourth problem;On Legendre cobordisms;Vassiliev invariants of knots in mathbb {R}^3 and in a solid torus;Finite type invariants of generic immersions of ^n into mathbb {R}^{2n} are trivial;On enumeration of unicursal curves;Vassiliev invariants classify flat braids;New Whitney-type formulas for plane curves;Tree-like curves and their number of inflection points;Geometry of exact transverse line fields and projective billiards;Shadows of wave fronts and Arnold-Bennequin type invariants of fronts on surfaces and orbifolds;A unified approach to the four vertex theorems. I;A unified approach to the four vertex theorems. II;Topology of two-connected graphs and homology of spaces of knots