Article reviews fossil and contemporary genetic data for Slavic origins. Integrates archaeology and other sciences. Provides humanities insight into genetic research state. Introduces genetic material and analysis methods. Discusses data interpretation challenges. Corded ware culture graves found at Łękawa site. Four graves discovered, three contain skeletons. Grave 1 holds fragmented human bones in oval pit. Skeleton in grave 1 laid on left side, head north, legs contracted. Grave 1 bones include right pelvis with degenerative hip pathology. Grave 1 has femur head fragment and calcaneus. Grave 1 contains unworn left M1 crown and long bone fragments. Grave 1 tibia shows mild tuberosity development. Grave 1 includes fibula, patella, and lower femur epiphysis.