EarthKingdom-busting volcanoes linked to the rise of the Roman Empire Unrest that spelled the end of the Ptolemaic Kingdom, paving the way for the Roman Empire, may have been triggered by droughts caused by eruptions 51¶¯Âþ
LifeNorse legend? The Viking 'GPS' that relied on crystals Nearly 50 years on, there's still no consensus on the intriguing theory that Viking sailors navigated by viewing the sky through crystal slabs Features