Following U.S. students across five summers between grades 1 and 6, a little more than half (52 percent) experienced learning losses in all five summers, according to a large national study. Students in this group lost an average of 39 percent of their total school year gains during each summer.

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The combined use of antiretroviral medications lopinavir and ritonavir, previously used to treat SARS-Cov-1 and MERS-Cov patients, appeared to cause bradycardia in 22% of elderly, critically ill COVID-19 patients, in a small study in France. Bradycardia was resolved in all patients after discontinuation or dose reduction of both medications.

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A study contains bad news and good news about Covid-19 misinformation -- and a new insight that may help reduce the problem.

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A new study shows that increases in the concentrations of blood sodium can have an influence on the biological clock of mice, opening new research avenues for potentially treating the negative effects associated with long distance travel or shift work.

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Current research indicates that unhealthy lifestyle choices, including smoking and lack of exercise, along with emotional stressors like social isolation and interpersonal conflicts are important risk factors for developing upper respiratory infections. It is possible these same factors also increase the risk of contracting COVID-19.

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A new study suggests that front-line health care workers are at high risk for COVID-19 and that many health care workers with the virus may not have typical symptoms of a respiratory infection.

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A survey conducted in the U.K. suggests that social and physical distancing measures put in place during the Covid-19 pandemic significantly impacted people's perception of how quickly time passed compared to their pre-lockdown perceptions.

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Researchers have characterized the structure of the SARS-CoV-2 spike protein as well as its most similar relative in a bat coronavirus. The structures provide clues about how the spike evolved and could help inform vaccine design.

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In one of the first studies addressing the role of sex hormones' impact on stem cells in the gut, scientists outline new insights showing how a steroidal sex hormone, ecdysone, drastically alters the way intestinal stem cells behave, ultimately affecting the overarching structure and function of this critical organ.

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A new study sheds light on proteins in particles called extracellular vesicles, which are released by tumor cells into the bloodstream and promote the spread of cancer. The findings suggest how a blood test involving these vesicles might be used to diagnose cancer in the future, avoiding the need for invasive surgical biopsies.

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Due to climate changes, many regions are experiencing increasingly warmer and dryer summers, followed by heavy rain. New study shows this is a fatal combination that can cause massive fish kills in lakes within a few hours.

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Research finds that chatbots -- software applications that conduct online chats via text or text-to-speech -- working for reputable organizations can ease the burden on medical providers and offer trusted guidance to those with symptoms.

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Higher consumption of fruit, vegetables and whole grain foods are associated with a lower risk of developing type 2 diabetes, according to two new studies.

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A clinical trial has found evidence that the experimental drug tofersen lowers levels of a disease-causing protein in people with an inherited form of amyotrophic lateral sclerosis, or ALS, caused by mutations in the gene SOD1.

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Differences in lung physiology and immune function in children could be why they are more often spared from severe illness associated with COVID-19 than adults.

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