Mar 13, 2018mammothhawk229e rated this title 4.5 out of 5 stars
New Scientist thought though 55 alternative reality multiuniverse scenarios. Some in rule change (time run backward in universe), some in past (eg. industrial revolution using electrical motors), near future (could replicators end material scarcity) to far future (could Earth outlive the Milky way).
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The Universe Next Door