Hyenas Once Lived above Arctic Circle

sci-news.com – Paleontologists have found two fossilized teeth of extinct cursorial hyenas (genus Chasmaporthetes) in the remote Old Crow River region in northern Yukon Territory, Canada.

Source: Z. Jack Tseng, Grant Zazula, Lars Werdelin. First Fossils of Hyenas (Chasmaporthetes, Hyaenidae, Carnivora) from North of the Arctic Circle. Open Quaternary, 2019.

How Did a Virus From the Atlantic Infect Mammals in the Pacific?

nytimes.com – Thawing sea ice may have opened the door, allowing the infection to cross oceans, a new study suggests.

Source: E. VanWormer, et al. Viral emergence in marine mammals in the North Pacific may be linked to Arctic sea ice reduction. Scientific Reports, 2019.

NASA’s Voyager 2 Spacecraft Sends Back New Data on Interstellar Space

sci-news.com – In November 2018, NASA’s Voyager 2 spacecraft became only the second human-made object to cross the outer edge of the Sun’s heliosphere, the bubble of space filled by the solar wind. In a series of five papers in the journal Nature Astronomy, researchers describe what they observed during and since Voyager 2’s historic exit.

Source: Edward C. Stone, Alan C. Cummings, Bryant C. Heikkila, Nand Lal. Cosmic ray measurements from Voyager 2 as it crossed into interstellar space. Nature Astronomy, 2019.

Early Rome featured a surprising amount of genetic diversity

upi.com – During its long history, Rome has been shaped by a tremendous amount of genetic diversity. It was, new research suggests, one of the earliest urban melting pots.

Source: Margaret L. Antonio, et al. Ancient Rome: A genetic crossroads of Europe and the Mediterranean. Science, 2019.

¿Por qué a ella no le dio alzhéimer? La respuesta podría ser clave para combatir la enfermedad

nytimes.com – Investigadores en Colombia y Estados Unidos descubrieron a una mujer con una mutación genética extraña que la ha protegido de la demencia a pesar de que su cerebro ha desarrollado características neurológicas significativas de la enfermedad.

Source: Joseph F. Arboleda-Velasquez, et al. Resistance to autosomal dominant Alzheimer’s disease in an APOE3 Christchurch homozygote: a case report. Nature Medicine, 2019.

Keep It Little ‘Germy’: Clean House Is Not Always Healthy, Study Finds

medicaldaily.com – Researchers discovered that the use of cleaning products could allow fungi to form and spread around the house.

Source: Laura-Isobel McCall, et al. Home chemical and microbial transitions across urbanization. Nature Microbiology, 2019.

It keeps going: 1 meter sea-level rise by 2300 is now inevitable

arstechnica.com – Analyzing a longer timeline, even if we ceased emissions in 2030.

Source: Alexander Nauels, et al. Attributing long-term sea-level rise to Paris Agreement emission pledges. Proceedings of the National Academy of Sciences, 2019.

Neanderthal demise may have been due to human-borne diseases

zmescience.com – Back and forth transmission of disease between humans and Neanderthals may have kept the two species in check -- but only for a while.

Source: Gili Greenbaum, et al. Disease transmission and introgression can explain the long-lasting contact zone of modern humans and Neanderthals. Nature Communications, 2019.

Researchers Develop Fast-Charging Self-Heating Lithium-Ion Battery

sci-news.com – A team of researchers at the Pennsylvania State University has demonstrated that they can charge an electrical vehicle in 10 minutes for a 200 to 300 mile (300-500 km) range.

Source: Xiao-Guang Yang, et al. Asymmetric Temperature Modulation for Extreme Fast Charging of Lithium-Ion Batteries. Joule, 2019.

New Study Reveals Key Component in Neurophysiology of Sleep

sci-news.com – A new study, led Boston University researchers, shows that slow oscillating neural activity during non-rapid eye movement (NREM) sleep triggers waves of cerebrospinal fluid that flow in and out of the sleeping brain, washing it of harmful metabolic waste products.

Source: Nina E. Fultz, et al. Coupled electrophysiological, hemodynamic, and cerebrospinal fluid oscillations in human sleep. Science, 2019.