Misc: What alkaloid is derived principally from the bark of the cinchona tree?

Questions

of which country is constanta the major port city?

in greek mythology, who is 'the dioscuri'?

what is the belief in the existence of a god or gods?

in the witwatersrand in 1886, near where were massive gold deposits discovered?

what is the meaning of the latin expression 'e pluribus unum'?