Should scientists spend time, money, and resources so that people can live 100 years or longer

they all focused on themes about the inevitability of death.

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.