Magellan proved Columbus' theory about the shape of the earth. He found an impractical water route to India. He also died before the journey was completed. The only thing that is not true is that Magellan sailed through the Isthmus of Panama.
I once stepped on a Lego and my foot hurt for like a week.
Slaves in the North did primarily work in stores and small craft centers. This was mostly true for the middle colonies as well. Slaves in the South worked in the fields.