Could someone please list some technologies that already existed during European overseas expansion in late fifteenth and early sixteenth centuries? For instance things like the compass or shipbuilding? Thank you!

Is the weather changing? consider the data of severe weather that includes tornadoes occurring throughout the u. s. over the last four years. compare the severe weather for the last three years. then compare the first three months of 2017 with that data. based on previous years, what might the prediction be for weather during 2017?