Science-fiction idea: time machine but it only runs on coal, and sending 1 human back 1 week (round-trip) burns enough coal to power Nigeria for a year 🤔
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loophole : sending humans back to the dinosaur age requiring more coal than there are dead dinosaurs to create
(Could leading to interesting, dark plot twists)
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ah yes, but somehow slaying dinosaurs to power your time machine in the future is much cooler than hunting down algae
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