Ep. 13: Geologists visit a hot spring hotel and discover cosmic spherules in rooftop dust.

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Geologists stay at an upscale hot-spring hotel where they identify a white stone ring as lime deposited from the spring water. Nagi discusses professional prospects for geologists, and the group observes shooting stars at night. She explains that rooftop dust might contain micrometeorites collectible with a magnet. Using a microscope, they locate a cosmic spherule. Ruri reflects on the enjoyment of scientific discovery and anticipates future findings.