The Substance That Was Everywhere... Until It Wasn't For most of human history, empty space was considered deeply suspicious. A vacuum-true nothingness-felt wrong. Not just scientifically questionable, but philosophically offensive. How could nothing exist? What would it even mean for something to be nowhere, doing nothing, affecting nothing? Nature, as it turns out, does not enjoy philosophical discomfort. Humans do. So we invented something to fill the gap. We called it ether.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $20. ThriftBooks.com. Read more. Spend less.