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Cave sediments suggest global cooling 13K years ago not caused by asteroid

Cave sediments suggest global cooling 13K years ago not caused by asteroid

Science
July 31 (UPI) -- Geochemical signatures found in sediments recovered from a Texas cave suggest the Younger Dryas, a period of global cooling that occurred 13,000 years ago, was caused by a series of Earth-based processes, not an extraterrestrial impact. Previously, scientists in search of an explanation for the Younger Dryas have pointed to spikes in several rare earth metals as evidence that an asteroid or comet impact triggered the cooling. Advertisement Most recently, when researchers looked at the sedimentary evidence, they found these spikes in rare earth metals actually featured relatively low concentrations of iridium, ruthenium, platinum, palladium and rhenium -- levels inconsistent with an extraterrestrial impact event. "The isotopic signatures and concentrations can be explained...
One in 400 people in England has coronavirus, tests suggest

One in 400 people in England has coronavirus, tests suggest

Health
One in 400 people in England is infected with coronavirus, a survey of 11,000 people in households suggests.They were asked to carry out swab tests over the two weeks up to 10 May.This indicates about 148,000 people in England could be currently infected - 0.27% of the population.And this could help ministers calculate the reproduction (R) number, or transmission rate, of the virus and whether tracking the contacts of infected people is feasible.The study is set to expand over time to test 25,000 people in private households across all four UK nations. Who is being tested in the UK? What is the UK's test, track and trace strategy? The 5,000 households tested in this survey did not include hospital patients or people living in care homes, where rates of C...
Rural areas may be ’emerging hotspots’ for COVID-19, CDC figures suggest

Rural areas may be ’emerging hotspots’ for COVID-19, CDC figures suggest

Health
April 10 (UPI) -- Thus far, New York and New Jersey have borne the brunt of the COVID-19 pandemic, and researchers say the way state and local governments have prepared will determine where it strikes next. An analysis of data published Friday by the U.S. Centers for Disease Control and Prevention suggests there could be two types of problem area in the United States going forward -- densely packed downtown areas, like New York City, and less populated areas in the midwest, for example. By Tuesday, there were nearly 400,000 confirmed cases of COVID-19, the disease caused by the new coronavirus, across the country, with all 50 states reporting at least one case, according to the new CDC figures. However, prevalence of the virus varied widely between states, with places like New York City ...
Cave deposits suggest Earth experienced dramatic sea level rise 4 million years ago

Cave deposits suggest Earth experienced dramatic sea level rise 4 million years ago

Science
Aug. 30 (UPI) -- Scientists have discovered ancient deposits in the Artà Cave on the island of Mallorca that suggest sea levels 3.5 to 4 million years ago were more than 50 feet higher than they are today. Analysis of the speleothems, or cave formations, could help scientists more accurately predict how modern climate change will influence sea level rise in the decades ahead. To predict how melting ice sheets will affect sea levels across the globe, scientists need historic benchmarks. Mineral deposits in the Artà Cave have provided just that. "Constraining models for sea-level rise due to increased warming critically depends on actual measurements of past sea level," Victor Polyak, research scientist at the University of New Mexico, said in a news release. "This study provides very robu