Human Y-chromosome MRCA lived 254kya (192-307kya) in Africa. African A and B haplogroups separated from rest by 236 markers. African-non-African lineages split 68-72kya (52-87kya). 15ky gap before non-African haplogroups diversified 47-52kya (36-62kya). Non-African founders match rapid Eurasia-Oceania colonization 50kya. Many Eurasian Y-haplogroups coalesce last 15ky post-Last Glacial Maximum. Region-specific Y-clades cluster 4-8kya. Americas peopled around 15kya per Y-divergences. Male effective population size (Ne) consistently half or less of female Ne. Global Y-Ne dropped sharply 8-4kya while female Ne rose 17-fold. Male Ne crash coincides with Neolithic spread and social shifts. Cultural changes hiked male reproductive variance via polygyny or conquest. Male Ne dips match farming timelines: Near East earliest, then Asia, Europe latest. Y-results unfit selection – favor cultural inheritance of fitness. Autosomal Ne should mirror low male Ne per models. Whole Y-sequencing best resolves human paternal history.