David Lewis: 2 ideas worth knowing

2 ideas from David Lewis, each explained in a minute and credited to the original work. Free on Savvy.

David Lewis argued every possible world is exactly as real as this one
Philosopher David Lewis defended 'modal realism': when we say something is merely possible, we aren't speaking loosely — a concrete world where it actually happens really exists, j…
— David Lewis, On the Plurality of Worlds
Polynesian sailors crossed thousands of miles of open ocean with no instruments
Long before the compass or GPS existed, Polynesian navigators settled islands scattered across millions of square miles of the Pacific using only the stars, wave patterns, cloud fo…
— David Lewis, We, the Navigators: The Ancient Art of Landfinding in the Pacific

Five ideas worth knowing, every week