  There are many problems and configurations in Euclidean geometry that were
never extended to the framework of (normed or) finite dimensional real Banach
spaces, although their original versions are inspiring for this type of
generalization, and the analogous definitions for normed spaces represent a
promising topic. An example is the geometry of simplices in non-Euclidean
normed spaces. We present new generalizations of well known properties of
Euclidean simplices. These results refer to analogues of circumcenters, Euler
lines, and Feuerbach spheres of simplices in normed spaces. Using duality, we
also get natural theorems on angular bisectors as well as in- and exspheres of
(dual) simplices.
