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12 de feb. de 2021 · CREDIT: FRITZ ET AL., SCI. ADV. 10.1126/SCIADV.ABE9510 (2021) Although flutes and whistles made of bone have been found at Upper Paleolithic archaeological sites in Europe, musical instruments made of other materials are uncommon. Fritz et al. have identified the earliest known conch shell in the world, dating from about 17,000 years ago, which ...
23 de jul. de 2021 · Mars likely has a 24- to 72-kilometer-thick crust with a very deep lithosphere close to 500 kilometers. Similar to the Earth, a low-velocity layer probably exists beneath the lithosphere. The crust of Mars is likely highly enriched in radioactive elements that help to heat this layer at the expense of the interior.
11 de jun. de 2021 · Because the amount of KRP4, which binds to mitotic chromosomes, is titrated to the amount of chromosomal DNA, daughter cells begin with similar amounts of KRP4 despite possible asymmetric cell divisions. Deviations are adjusted as excess KRP4 is degraded and the cell size is normalized. Science, abb4348, this issue p. 1176.
1 de ene. de 2021 · Caroline Ash. By the end of July 2020, Kenya h ad reported only 341 deaths and ∼20,000 cases of COVID-19. This is in marked contrast to the tens of thousands of deaths reported in many higher-income countries. The true extent of COVID-19 in the community was unknown and likely to be higher than reports indicated.
2 de abr. de 2021 · An ever-growing human footprint. Sacha Vignieri. Human activities—especially fishing—are disrupting marine life, like these Steller's sea lions, at an ever-increasing scale. Human activities are increasingly affecting the marine environment but understanding how much and in what ways is an extreme challenge given the vastness of this system.
18 de jun. de 2021 · These findings illustrate the potential of modern artificial intelligence (AI) to better track and predict local epidemic dynamics up to several weeks ahead of current health care–based surveillance systems, which would support better public health policy and individual decisions. Sci. Adv. 10.1126/sciadv.abb1237 (2021).
16 de abr. de 2021 · Andrew M. Sugden. A burned black spruce forest in Alaska quickly recovers, with deciduous species dominating after fires that burn deep. Wildfire activity has been increasing in the boreal forests of the Northern Hemisphere, releasing carbon into the atmosphere from biomass and soil, with potential feedback to climate warming.
