J. Whittaker: Revisionist efforts attempt to refute accounts of Aztec sacrifice as “racist, colonialist” etc. But our understanding of large-scale sacrifice not based only on Spanish accounts, also arch evidence of ritual violence - experiments in heart excision, serological study of deposits, forensic analysis of skeletal remains, including numerous sites with evidence of peri-mortem mutilation and cannibalism, 170 crania from tsompantli skull rack at Tlatelolco associated with stone tools used to prep heads, etc.