In species in which males care for young, testosterone (T) is often high during mating periods but then declines to allow for caregiving of resulting offspring. This model may apply to human males, but past human studies of T and fatherhood have been cross-sectional, making it unclear whether fatherhood suppresses T or if men with lower T are more likely to become fathers.
Recent studies have revealed that 2–3% of the genome of non-Africans might come from Neanderthals, suggesting a more complex scenario of modern human evolution than previously anticipated. In this paper, we use a model of admixture during a spatial expansion to study the hybridization of Neanderthals with modern humans during their spread out of Africa.
A long-debated question concerns the fate of archaic forms of the genus Homo: did they go extinct without interbreeding with anatomically modern humans, or are their genes present in contemporary populations? This question is typically focused on the genetic contribution of archaic forms outside of Africa.
Land surveying in ancient states is documented not only for Eurasia but also for the Americas, amply attested by two Acolhua–Aztec pictorial manuscripts from the Valley of Mexico. The Codex Vergara and the Códice de Santa María Asunción consist of hundreds of drawings of agricultural fields that uniquely record surface areas as well as perimeter measurements.
After nearly 15 years of excavation, the most complete hominin skeleton ever discovered, dubbed "Little Foot," is expected to be out of the cave in which it was discovered within the next 2 months.Author: Michael Balter
Partial skeletons of 2-million-year-old hominin Australopithecus sediba leave researchers impressed by their completeness but scratching their heads over the implications for our family tree.Author: Ann Gibbons
After nearly 15 years of excavation, the most complete hominin skeleton ever discovered, dubbed "Little Foot," is expected to be out of the cave in which it was discovered within the next 2 months.Author: Michael Balter
Partial skeletons of 2-million-year-old hominin Australopithecus sediba leave researchers impressed by their completeness but scratching their heads over the implications for our family tree.Author: Ann Gibbons
After nearly 15 years of excavation, the most complete hominin skeleton ever discovered, dubbed "Little Foot," is expected to be out of the cave in which it was discovered within the next 2 months.Author: Michael Balter
Partial skeletons of 2-million-year-old hominin Australopithecus sediba leave researchers impressed by their completeness but scratching their heads over the implications for our family tree.Author: Ann Gibbons
