States are coordinating the actual administration of vaccines on their own. “We’ve got 50 states and 50 different plans. We do not have a single coordinated policy in terms of how this should be done optimally, so it’s the left to the states."

Still unclear is what percentage of a population needs to be vaccinated or recovered from COVID-19 before herd immunity kicks in.

The concern isn’t just that people will get picky about which vaccine they want, slowing down the task of inoculating enough of the population to blunt the impact of Covid-19.

New variants could bring more reinfections, but fewer cases of severe COVID-19.

Informative comparisons in graphs.

A high-production brewery believed to be more than 5,000 years old has been uncovered by a team of archaeologists at a funerary site in southern Egypt.

Find backs theory that bluestones first stood at Waun Mawn before being dragged 140 miles to Wiltshire.

Discover capsaicin, the active ingredient in chile peppers. (If you can take the heat.)

The father of our country suffered horribly with dental pain. Today, the dental profession has many ways to relieve dental pain and to replace missing teeth so that they look and feel like natural ones.

The logistic map is famous for two reasons: it gives a way of predicting how a population of animals will grow or shrink over time, and it illustrates the fascinating phenomenon of mathematical chaos.

Perseverance, NASA’s latest Mars rover, will begin its descent to the planet’s Jezero Crater on Thursday, nearly seven months after it first launched from Cape Canaveral.

A new model explains a possible route for the extraterrestrial rock before it blasted Earth

The orbits of a handful of distant lumps of rock are not bunched together by the gravity of Planet Nine, as its proponents believe, but only seem clustered because that’s where telescopes happened to be looking.

NASA’s sole means of sending commands to the distant space probe, launched 44 years ago, is being restored on Friday.

A new study shows that extreme black holes could break the famous “no-hair” theorem, and in a way that we could detect.  

A century ago, few Americans had any idea how much they weighed. Here’s why that changed so dramatically.

Coca-Cola is to test a paper bottle as part of a longer-term bid to eliminate plastic from its packaging entirely.

A key aspect of this is the Lunar Gateway, an orbiting habitat that will allow astronauts to make regular trips to and from the lunar surface.

This so-called solar geoengineering is the ultimate, break-the-glass response to the climate crisis.

Sun Cable is developing the world's largest solar energy infrastructure network.

The more you do, the better, but even mild exercise like walking produces benefits for cardiovascular health, a large new study found.

The tests also found glyphosate in other kinds of dry and canned beans, dry lentils and garbanzo flour.

A study of the direct interaction between p53 and the green tea compound, EGCG, points to a new target for cancer drug discovery.

Winter activities are some of the best ways to get fit, and as counterintuitive as it might sound, exercise can sometimes be even more pleasant in the cold.

Fears of illness over nitrites used in US but currently banned in Britain and EU.

The Antarctic delivers surprising insights into life and survival.

The animals who inspired the unicorn legend exist in real life, and they are completely fascinating.

The Pacific Ring of Fire is aptly named. It's a string of volcanoes in the Pacific Ocean, and the region is prone to earthquakes. In fact, most earthquakes strike within the ring. Here's five facts.

What is it about DNA that makes the human brain “human?”

One persistent theory about the origin of life on Earth is that life began in the deep ocean with hot, acidic vents known as black smokers.

The state’s widespread electricity failure was largely caused by freezing natural gas pipelines. That didn’t stop advocates for fossil fuels from trying to shift blame.

Cities don't just have sea level rises to worry about – they're also slowly sinking under the weight of their own development.

And why they’re scared we might break up with their favorite appliance.

The American environmental movement, and environmental politics in general, are in middle age.

Internal government emails show actions similar to those by Bayer and lobbyists to kill a proposed ban in Thailand in 2019.

How ingredients came together for an onslaught of bone-chilling temperatures and a barrage of storms.

The Microsoft co-founder discusses his new book, the limits of his optimism, the tech breakthroughs and energy policies we need—and how his thinking on climate change has evolved.

"If we continue with large ongoing emissions as we are at present, we will commit the world to meters of sea level rise over coming centuries."

Icebergs are melting faster than current models describe.

As the climate warms, this historic river poses a flooding risk to nearby landmarks.