The american recovery and reinvestment act was a reaction to what event in the united states?

How did german physicist werner heisenberg's uncertainty principle shake beliefs in newtonian physics?

Examine these two paintings that depict famous events from american history. the image on the left, painted in 1940, shows the signing of the u.s. constitution in 1787. the image on the right, painted in 1836, shows the american victory at the battle of yorktown in 1781.which of these paintings should be considered a secondary source?

Plz the 10 places that charles darwin stopped at to report his findings, and include dates?