Norway's proximity to the USSR in the Cold War led to it building many military bunkers – some of them vast secret bases.

"Where would the scale tip? On the left is a steel ball, on the right a ping-pong ball," Reddit user Veiy wrote, posing the conundrum. "I think the scale would raise to the right since the [buoyancy] ...

Open Google Maps and tap your profile icon in the top right corner, then select Location sharing. Tap Share location, choose ...