The mystery of Hopperstad Stave Church
What is the white substance that covers parts of Hopperstad Stave Church in Norway? Where does it comes from? Marit Lehne packs her portable spectrometer, dons… Read more »
What is the white substance that covers parts of Hopperstad Stave Church in Norway? Where does it comes from? Marit Lehne packs her portable spectrometer, dons… Read more »