A trapped cloud of ultracold atoms, colder than almost anything found in nature, has become the setting for a deceptively simple question: if a universe has no built-in clock, how could anything insid... A trapped cloud of ultracold atoms, colder than almost anything found in nature, has become the setting for a deceptively simple question: if a universe has no built-in clock, how could anything inside it tell what comes first and what comes next? Th... [7611 chars]
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