He said he saw no burned wires inside the mosque and said the building's fuse box was in good condition.

WSJ: Mosque Fire Kills 13 Children in Myanmar

Zaw Min Htun said he saw no burned wires inside the mosque and said the building's fuse box was in good condition.

NPR: 13 Youths Die In Fire Myanmar Police Call Accident

All that was needed to make a mechanical energy-storage system was a good enough rotational seal, so the flywheel could spin freely inside a vacuum chamber with no air resistance.

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