An exploration of what historians and archaeologists say about the hypothesis that Vikings used "sunstones" with special optical properties to navigate.
Download PDF.
An exploration of what historians and archaeologists say about the hypothesis that Vikings used "sunstones" with special optical properties to navigate.
Download PDF.
The Unseen - A History of the Invisible
A series of five programmes looking at amazing events and characters from science history, on BBC Radio 4.
They are available for some time on the BBC iPlayer here.
Beyond Weird Read more here...