A line segment joining a vertex of a tetrahedron with the centroid of the opposite face is called a median and a line segment joining the midpoints of two opposite edges is called a bimedian of the tetrahedron. Source: Internet
All non-self-crossing quadrilaterals tile the plane by repeated rotation around the midpoints of their edges. Source: Internet
Corollary concerning midpoints and endpoints of chords A corollary of the above discussion is that if a parabola has several parallel chords, their midpoints all lie on a line which is parallel to the axis of symmetry. Source: Internet
At the midpoints between these four solar events, cross-quarter days are celebrated. Source: Internet
He secured the feathers at their midpoints with string and at their bases with wax, and gave the whole a gentle curvature like the wings of a bird. Source: Internet
The intervals above all have the same length on them, with the "midpoints" actually midway. Source: Internet