| But what if the empty half of the glass were actually empty—a vacuum? (Even a vacuum arguably isn’t truly empty, but that’s a question for quantum semantics.) | |
| The vacuum would definitely not last long. But exactly what happens depends on a key question that nobody usually bothers to ask: | Which half is empty? |
| For our scenario, we’ll imagine three different half-empty glasses, and follow what happens to them microsecond by microsecond. |
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August 17, 2012
