Notes on verification

Men's 1968 debut is well-corroborated by multiple high-quality sources (World Athletics, Olympics.com, Britannica). The 1972 women's date is less precise—no source states the technique was formally 'introduced' for women that year; rather, Ulrike Meyfarth won gold using it at the 1972 Munich Games while other women still used the straddle technique, and some women (e.g., Debbie Brill) had used similar techniques earlier. The claim's framing slightly overstates a clean 'introduction' date for women. [cascade flags: aggregator_dropped_primary_exists,wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.925 clusters=4 claim_tier=notable | kind=empirical eligibility=high]