How long ago did the Chinese transition from steam as a way to power a rocket to gun powder?

Averb diagram that shows the similarities and differences of two african kingdoms

17 million negroes cannot do as you suggest qnd wait for the hearts of men to change. tjis we cannot do unless we persue aggressively goals which all other americans achieved ove 150 years ago. how might martin luther king jr. respond to this statement?

According to okun's law, if the unemployment rate goes from 2% to 5%, what will be the effect on the gdp?