In Norse Mythology the bridge leading from the realm of the mortals Midgård to the realm of the gods Asgård. The bridge itself is the rainbow and its guardian is the god Heimdall. The bridge is destroyed at the end of the world, Ragnarok. It as built by the Aesir.
... powered by a little generator embedded in the gyroscope.
The physics of this device looks confusing at first sight, but is surprisingly simple. It can easily b ...