Carl Sagan: To make an apple pie, first invent the universe

pkrumins · 1 min · 2010 · YouTube title: Carl Sagan: If you wish to make an apple pie from scratch, you must first invent the universe.

Why it's here

HN commenters use the quote as shorthand in arguments about abstractions, standing on others' work and the limits of building from scratch.

What it covers

A very short clip of Carl Sagan saying that to make an apple pie from scratch you must first invent the universe. It illustrates how everything depends on a chain of prior things.