PPM citadel in the Harz national park?
Added 2022-01-30 00:21:36 +0000 UTCAll the photos: https://imgur.com/a/sEUIJK2
Comments
I have an idea, Free-Falling Interferometry: https://physics.aps.org/articles/v6/23
Runkelmunkel
2022-12-05 07:57:29 +0000 UTCI'd ask TPAI to give it a once over. He'd be able to evaluate its utility pre-apocalypse. Would be the best collaboration vid ever.
Marion Makarewicz
2022-02-05 04:44:57 +0000 UTC
