- Independent journalists continued to be subjected to threats and intimidation in 2023. War crimes prosecutions remained slow, inefficient, and marred by delays. Attacks and threats against lesbian, gay, bisexual, and transgender (LGBT) people and organizations continued. Serbia and Kosovo signed a joint declaration on missing persons in May as part of an EU-brokered normalization process, but relations deteriorated after clashes in northern Kosovo later that month linked to a contested election.
- Tetrahedron (Wikipedia)
In geometry, a tetrahedron (pl.: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices. The tetrahedron is the simplest of all the ordinary convex polyhedra.