Paleontologists have found the earliest known evidence that dinosaurs lived in herds — unlike reptiles, and more like penguins and other birds do today — and socialized with each other by age groups. The scientists, working a rich deposit of fossils at a site in Argentina’s province of Santa Cruz, at the southern tip of […]
WASHINGTON — The Food and Drug Administration authorized booster shots on Wednesday for tens of millions of recipients of Moderna’s two-dose coronavirus vaccine and Johnson & Johnson’s single-dose shot, significantly expanding efforts to bolster protection for vulnerable Americans. The agency also authorized medical providers to give people a booster shot of a different Covid-19 vaccine, […]
CHICAGO — The Massachusetts Institute of Technology invited the geophysicist Dorian Abbot to give a prestigious public lecture this autumn. He seemed a natural choice, a scientific star who studies climate change and whether planets in distant solar systems might harbor atmospheres conducive to life. Then a swell of angry resistance arose. Some faculty members […]
When Jim Lewis was told earlier this month that his 90-year-old mother, who lives in a nursing home outside of Boise, Idaho, tested positive for Covid-19, he wondered if she had gotten the virus from an unvaccinated employee. And he had reason to worry. A little more than half of the workers in the home, […]
The news report that emerged over the weekend sounded alarming: China, a rising military power, had unexpectedly fired a novel space weapon two months ago. It circled the planet and then re-entered Earth’s atmosphere, gliding at velocities far faster than the speed of sound toward a destination on Chinese territory. As a military capability, bombarding […]
Upending centuries of medical dogma, a team of South African researchers has found that breathing may be a bigger contributor to the spread of tuberculosis than coughing, the signature symptom. As much as 90 percent of TB bacteria released from an infected person may be carried in tiny droplets, called aerosols, that are expelled when […]
The Pfizer-BioNTech vaccine was 93 percent effective against hospitalization with Covid-19 among 12- to 18-year-olds, the Centers for Disease Control and Prevention reported on Tuesday, the strongest evidence to date of the vaccine’s ability to keep young people out of the hospital. With federal regulators now considering authorizing the vaccine for children ages 5 to […]
The same risks identified in studies about ambulance responses apply generally to police and fire responses as well, though the dispatching criteria and cultures in those public safety disciplines can vary widely, experts said. In the case of ambulances, some medical services strive to meet response times based on studies from the 1970s, when devices […]
The National Hockey League announced on Monday that it had suspended the San Jose Sharks forward Evander Kane for 21 games, without pay, for “an established violation” of the league’s Covid-19 protocol. The announcement did not explain how Mr. Kane had violated the protocols, but several news organizations, including The Associated Press, reported that he […]
A recent paper by Dr. Ross and Dr. Williams, who are close friends, examines Panama and Colombia as a test case. An ancestry estimation might suggest people from both countries would have similarly shaped skulls. But population affinity acknowledges that the trans-Atlantic slave trade and colonization by Spain resulted in new communities living in Panama […]
