A Norwegian town built a giant mirror to deflect the sun (2017)
This is sort of off topic, but this valley is pretty famous actually for being a strategic place in World War II (but not widely known) because it was a crucial source of heavy water.<p>If you haven't seen it already, I'd highly recommend the Netflix series "The Heavy Water War" (trailer: <a href="https://www.youtube.com/watch?v=_K3Ry2K4yNE" rel="nofollow">https://www.youtube.com/watch?v=_K3Ry2K4yNE</a>)