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You probably know that Magellan is famed for attempting to circumnavigate the globe. But you may not know that he didn't make it—he kicked the bucket along the way.
The moral? Getting to new places, as you learned to do in Hour 5, is only half of navigating. The other half is getting back to places you've been. If poor Magellan had had bookmarks (or favorites), a history file, or even a lowly Home button, he'd have made it full-circle.