Hi - i am Denis Cherevichnik. I live between Sheffield (UK) and Riga (Latvia). Social, cultural and weapons historian. Writer. President of TEMAF (Traditional European Martial Arts Federation). Wrote a dozen of scientific published peer-reviewed works, including two monographs. Research interests: knife cultures in European and American countries from the 17th to the 20th centuries; reasons for their emergence, decline and disappearance; Criminal and administrative law regulating the manufacture, use, ownership, and carrying of knives in the legislation of European and American countries of the Modern Era. Own two officially registered knife brands, and three UK patents for a folding knives. Hobby - knife making, boxing and HEMA fencing (Spanish).