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243,007 articles from PhysOrg

How reindeer eyes transform in winter to give them twilight vision

Reindeer are loved the world over for their dark, expressive eyes, majestic antlers and magical association with Santa Claus. The moment you learn the cold, hard truth of how Christmas presents arrive under the tree is a harrowing one that blights many a childhood. But reindeer are more special than your cynical older sibling or classmates would have had you believe.

Waiting for the sun to set to find a rare bird

When most people are just getting home from their workdays, I'm about to start mine. I am a researcher studying the breeding behavior of the Eastern whip-poor-will (Antrostomus vociferus), a cryptic bird that is primarily active after sunset as it forages on the wing for moths. So—for the summer, at least—I also am nocturnal.

Decrease in CO2 emissions during pandemic shutdown shows it is possible to reach Paris Agreement goals

An international team of researchers has found that the sudden drop in CO2 emissions during the early days of the COVID-19 pandemic demonstrates that it is possible to reduce emissions enough to meet the 1.5 degrees Celsius global temperature increase goal. In their paper published in the journal Nature Geoscience, the researchers describe studying aspects of the sudden drop of CO2 emissions in...

Red supergiant stars bubble and froth so much that their position in the sky seems to dance around

Making a 3D map of our galaxy would be easier if some stars behaved long enough to for us to calculate the distances to them. However, red supergiants are the frisky kids on the block when it comes to pinning down their exact locations. That's because they appear to dance around, which makes pinpointing their place in space difficult. That wobble is a feature, not a bug, of these massive old...

Here are the most effective things you can do to fight climate change

Limiting global warming to 1.5℃ above pre-industrial levels requires reaching net zero emissions by the middle of this century. This means that, in less than three decades, we need to reverse more than a century of rising emissions and bring annual emissions down to near zero, while balancing out all remaining unavoidable emissions by actively removing carbon from the atmosphere.

How to find marker genes in cell clusters

Which genes are specific for a certain cell type, i.e., "mark" their identity? With the increasing size of datasets nowadays, answering this question is often challenging. Often, marker genes are simply genes that have been found in specific cell populations. However, many more genes could be characteristic of a particular cell type but remain undiscovered.

India bans many single-use plastics to tackle waste

India imposed a ban on many single-use plastics on Friday in a bid to tackle waste choking rivers and poisoning wildlife, but experts say it faces severe headwinds from unprepared manufacturers and consumers unwilling to pay more.

Which rules evolutionary change: Life or climate?

The fossil record over the last half a billion years shows biodiversity as a zigzagging pattern of species births and extinctions. For decades scientist have attempted to answer the question: Which rules supreme—life or the environment? To explain this macroevolution, scientists have used two opposing theories: the Red Queen versus the Court Jester theory, inspired by the story Alice in...

A gentler, more precise laser cutting technique

Laser cutting techniques are usually powered by high energy beams, so hot that they melt most materials. Now scientists from McGill University have developed a gentler, more precise technique using low-power visible light.

How COVID-19 put poverty reduction back on the agenda

Lower income people bore the brunt of the economic repercussions of the COVID-19 pandemic. As a result, efforts to reduce poverty were adopted in Canada and the United States. But how did partisan politics shape each government's response? Exploring the political dynamics at play, a team of researchers including McGill University Professor Daniel Béland, traces the adoption and evolution of...

Capturing the onset of galaxy rotation in the early universe

As telescopes have become more advanced and powerful, astronomers have been able to detect more and more distant galaxies. These are some of the earliest galaxies to form in our universe that began to recede away from us as the universe expanded. In fact, the greater the distance, the faster a galaxy appears to move away from us. Interestingly, we can estimate how fast a galaxy is moving, and in...


THURSDAY 30. JUNE 2022


Active transportation projects offer solid returns on investment, economic study finds

Active transportation investments offer many types of benefits related to safety, reduced greenhouse gas emissions, physical activity and the economy. Metro, Oregon's regional government for the Portland metropolitan area, wants to better understand the role of these investments in building stronger communities in their region, and in implementing the Metro 2040 Growth Concept.