𝓙. 𝓜. on Nostr: The thread on surprising facts you found out recently by John Carlos Baez was getting ...

The thread on surprising facts you found out recently by John Carlos Baez (npub1nf4…nqe4) was getting a bit long, so I'm posting this entry separately: if I'm understanding https://en.wikipedia.org/wiki/Mohorovi%C4%8Di%C4%87_discontinuity#Exploration correctly, no manmade device has yet reached the Moho, the layer demarcating the boundary between the Earth's crust and mantle.