Vikings used a remarkable method to light fires, employing touchwood, a dried fungus that they boiled in urine. This process produced saltpeter, allowing the fungus to smolder for hours and carry a lasting spark over long journeys. This ingenious technique ensured that Vikings could start fires even in harsh conditions, demonstrating their resourcefulness and deep knowledge of natural materials for survival in extreme environments. #thefactspot #fblifestyle #vikinghistory #survivalskills #ancien