▁and ▁for ▁each ▁championship ▁publish es ▁the ▁full ▁scores ▁together ▁with ▁the ▁meet ings ' ▁reports . ▁ ▁Mart ial ▁arts ▁Although ▁it ▁was ▁popular ized ▁in ▁the ▁US ▁in ▁the ▁late ▁ 1 9 th ▁century ▁by ▁travel ing ▁acts ▁such ▁as ▁the ▁Bar num ▁& ▁Ba iley ▁Circ us , ▁the ▁history ▁of ▁kn ife ▁throwing ▁dates ▁much ▁further ▁back . ▁The ▁art ▁of ▁kn ife ▁throwing ▁was ▁first ▁used ▁in ▁mart ial ▁arts ▁or ▁hunting ▁applications . ▁It ▁has ▁been ▁incorpor ated ▁into ▁the ▁mart ial ▁discipl ines ▁of ▁the ▁Japanese ▁as ▁well ▁as ▁some ▁African ▁and ▁Native ▁American ▁tribes . ▁In ▁such ▁cases , ▁throwing ▁a ▁weapon ▁when ▁fighting ▁is ▁generally ▁thought ▁of ▁as ▁a ▁risk . ▁If ▁un success ful , ▁it ▁can ▁leave ▁the ▁thro wer ▁without ▁a ▁weapon ▁and ▁arm ▁his ▁attack er . ▁However , ▁many ▁war riors ▁tradition ally ▁carried ▁two ▁or ▁more ▁weapons ▁at ▁the ▁same ▁time . ▁ ▁Represent ations ▁The ▁opera ▁Queen ▁of ▁Kn ives , ▁which ▁premier ed ▁in ▁Port land , ▁Oregon ▁on ▁ ▁May ▁ 7 , ▁ 2 0 1 0 ▁tells ▁the ▁story ▁of ▁a ▁brother ▁and ▁sister ▁kn ife ▁throwing ▁act ▁in ▁the ▁midst ▁of ▁the ▁student ▁protest s ▁in ▁B irmingham ▁in ▁the ▁early ▁ 1 9 6 0 s . ▁ ▁See ▁also ▁▁ ▁Imp alement ▁arts ▁ ▁Th row ing ▁ax e ▁ ▁Notes ▁and ▁references ▁ ▁S ources ▁Collins , ▁Black ie . ▁Kn ife ▁Th row ing - S port