Kepler fine-tuned copernicus’ heliocentric model

What was the significant advancement of the caravel? a. it could sail with the wind c. it could sail against the wind b. it could sail at night d. it was motorized

Tension between the british. and boers was caused primarily by what things?

Is harry truman considered a hero or a tyrant for dropping the atomic bombs on hiroshima and nagasaki? (need a paragraph)