The original purpose of the magnetic compass was to help sailors to know which direction they should point their ships while they were sailing beyond the sight of land. On the open sea, you need some way of figuring out where you are and in which direction your destination lies, since the sea is relatively featureless and looks pretty much the same everywhere.
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The Greeks did not invent pizza.
The Romans didn't invent the microscope
They didnt invent it, it was there when it got defeated by Hercules.
what form of writing did the Sumerians invent
The Romans did not invent the lollipop. It was invented in the 19th century. George Smith claimed to be the first to invent the modern lollipop in 1908 and trademarked the lollipop name in 1931.