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Where America’s CO emissions come from – what you need to know, in charts

  • Written by Kenneth J. Davis, Professor of Atmospheric and Climate Science, Penn State
imageVehicles, energy production and industry are the largest emissions sources in the U.S.David McNew/Getty Images

Earth’s atmosphere contains carbon dioxide, which is good for life on Earth – in moderation. Plants use CO2 as the source of the carbon they build into leaves and wood via photosynthesis. In combination with water vapor, CO2 ins...

Read more: Where America’s CO emissions come from – what you need to know, in charts

Don’t write off the Putin-Trump summit just yet – its outcome might confound critics

  • Written by Peter Rutland, Professor of Government, Wesleyan University
imageThe Alaska summit is the first time the two leaders have met face-to-face since 2019.AP Photo/Alexander Zemlianichenko, Pool, Mark Schiefelbein, File

Like many such confabs before it, the Aug. 15, 2025, Alaska red carpet rollout for Russian President Vladimir Putin is classic Donald Trump: A show of diplomacy as pageantry that seemingly came out of...

Read more: Don’t write off the Putin-Trump summit just yet – its outcome might confound critics

4 out of 5 US troops surveyed understand the duty to disobey illegal orders

  • Written by Charli Carpenter, Professor of political science, UMass Amherst
imageNational Guard members arrive at the Guard’s headquarters at D.C. Armory on Aug. 12, 2025 in Washington. Anna Moneymaker/Getty Images

With his Aug. 11, 2025, announcement that he was sending the National Guard – along with federal law enforcement – into Washington, D.C. to fight crime, President Donald Trump edged U.S. troops...

Read more: 4 out of 5 US troops surveyed understand the duty to disobey illegal orders

How poisoned data can trick AI − and how to stop it

  • Written by M. Hadi Amini, Associate Professor of Computing and Information Sciences, Florida International University
imageData poisoning can make an AI system dangerous to use, potentially posing threats such as chemically poisoning a food or water supply. ArtemisDiana/iStock via Getty Images

Imagine a busy train station. Cameras monitor everything, from how clean the platforms are to whether a docking bay is empty or occupied. These cameras feed into an AI system...

Read more: How poisoned data can trick AI − and how to stop it

Spiderweb silks and architectures reveal millions of years of evolutionary ingenuity

  • Written by Ella Kellner, Ph.D. Student in Biological Sciences, University of North Carolina – Charlotte
imageAn orchard orb weaver spider rests in the center of her web.Daniela Duncan/Moment via Getty Images

Have you ever walked face-first into a spiderweb while on a hike? Or swept away cobwebs in your garage?

You may recognize the orb web as the classic Halloween decoration or cobwebs as close neighbors with your dust bunnies. These are just two among the...

Read more: Spiderweb silks and architectures reveal millions of years of evolutionary ingenuity

AI is making reading books feel obsolete – and students have a lot to lose

  • Written by Naomi S. Baron, Professor Emerita of Linguistics, American University
imageWorkarounds to reading a book cover-to-cover have existed for decades, but generative AI takes it to new heights.dem10/E+ via Getty Images

A perfect storm is brewing for reading.

AI arrived as both kids and adults were already spending less time reading books than they did in the not-so-distant past.

As a linguist, I study how technology influences...

Read more: AI is making reading books feel obsolete – and students have a lot to lose

Labor Day and May Day emerged from the movement for a shorter workday in industrial America

  • Written by Jeffrey Sklansky, Professor of History, University of Illinois Chicago
imageIt took more than a century for Chicago's Haymarket Square to get this memorial to the historic labor strife that occurred there. Jeffrey Sklansky

Most of the world observes International Workers’ Day on May 1 or the first Monday in May each year, but not the United States and Canada. Instead, Americans and Canadians have celebrated Labor Day...

Read more: Labor Day and May Day emerged from the movement for a shorter workday in industrial America

The new NextGen Acela trains promise faster travel and more seats – but arrive as US rail faces an uncertain future

  • Written by David Alff, Associate Professor of English, University at Buffalo
imageThe new Acela trains are scheduled to start running on the Northeast Corridor soon. Courtesy of Amtrak

When former President Joe Biden unveiled his US$1.9 trillion infrastructure plan in 2021, he found the perfect place to go public: Philadelphia’s 30th Street Station rail yard.

Over the din of crackling wires and grumbling engines, the...

Read more: The new NextGen Acela trains promise faster travel and more seats – but arrive as US rail faces an...

4 laws that could stymie the Trump EPA’s plan to rescind the endangerment finding that underpins US climate policies

  • Written by H. Christopher Frey, Glenn E. Futrell Distinguished University Professor of Environmental Engineering, North Carolina State University
imageU.S. Interior Secretary Doug Burgum, left, takes a selfie with Energy Secretary Chris Wright, center, and EPA Administrator Lee Zeldin in front of the Trans-Alaska oil pipeline.AP Photo/Jenny Kane

The Trump administration’s plan to unravel many of the nation’s climate policies hinges on rescinding what’s known as the endangerment...

Read more: 4 laws that could stymie the Trump EPA’s plan to rescind the endangerment finding that underpins...

More Articles ...

  1. The dark history of forced starvation as a weapon of war against Indigenous peoples
  2. Getting beyond answers like ‘fine’ and ‘nothing’: 5 simple ways to spark real talk with kids
  3. 4 laws that could stymie the Trump EPA’s plan to rescind the endangerment finding, central to US climate policies
  4. San Francisco and other cities, following a Supreme Court ruling, are arresting more homeless people for living on the streets
  5. Women in STEM face challenges and underrepresentation – this course gives them tools to succeed
  6. My research team used 18 years of sea wave records to learn how destructive ‘rogue waves’ form – here’s what we found
  7. US has slashed global vaccine funding – if philanthropy fills the gap, there could be some trade-offs
  8. This isn’t how wars are ended − a veteran diplomat explains how Trump-Putin summit is amateurish and politically driven
  9. Moose have lived in Colorado for centuries – unpacking the evidence from history, archaeology and oral traditions
  10. Inside an urban heat island, one street can be much hotter than its neighbor – new tech makes it easier to target cooling projects
  11. What is rust? A materials scientist explains metal’s crusty enemy
  12. Inside the search for sustainable aviation fuels, which are on the federal chopping block
  13. For Syrian Druze, latest violence is one more chapter in a centuries-long struggle over autonomy
  14. Schools are looking for chaplains, but the understanding of who – and what – chaplains are varies widely
  15. Trump administration cuts to terrorism prevention departments could leave Americans exposed
  16. 3 reasons Republicans’ redistricting power grab might backfire
  17. Bureau of Labor Statistics tells the US what’s up with the economy – Trump firing its top official may undercut trust in its data
  18. Authoritarian rulers aren’t new – here’s what Herodotus, an early Greek historian, wrote about them
  19. Industrial pollution once ravaged the Adirondacks − decades of history captured in lake mud track their slow recovery
  20. AI is taking hold in K-12 schools – here are some ways it can improve teaching
  21. NASA plans to build a nuclear reactor on the Moon – a space lawyer explains why, and what the law has to say
  22. Elon Musk’s plans for a new political party will likely be derailed by a US political system hostile to new voices
  23. Hulk Hogan and the unraveling of worker solidarity
  24. Gaza isn’t the first time US officials have downplayed atrocities by American-backed regimes – genocide scholars found similar strategies used from East Timor to Guatemala to Yemen
  25. Vaccines hold tantalizing promise in the fight against dementia
  26. Teen drivers face unique challenges during ‘100 deadliest days’ of summer, but safety measures can make a difference
  27. As the Colorado River slowly dries up, states angle for influence over future water rights
  28. ‘KPop Demon Hunters’ is attracting huge audiences worldwide – young Philadelphians told us K-pop culture inspires innocence, joy and belonging
  29. Understanding key terms swirling around Alligator Alcatraz and immigration enforcement in the US
  30. Transgender, nonbinary and disabled people more likely to view AI negatively, study shows
  31. A toxicologist’s guide to poison ivy’s itch and bee stings’ burning pain – 2 examples of nature’s chemical warfare
  32. Wildfire season is starting weeks earlier in California – a new study shows how climate change is driving the expansion
  33. Trump has promised to eliminate funding to schools that don’t nix DEI work – but half of the states are not complying
  34. How states are placing guardrails around AI in the absence of strong federal regulation
  35. History shows why FEMA is essential in disasters, and how losing independent agency status hurt its ability to function
  36. Iron nanoparticles can help treat contaminated water – our team of scientists created them out of expired supplements
  37. Youth athletes, not just professionals, may face mental health risks from repeated traumatic brain injuries
  38. Insurance warning signs in doctors’ offices might discourage patients from speaking openly about their health
  39. Where next for Khamenei? After war, Iran’s supreme leader is faced with difficult choices
  40. Philadelphia is using AI-driven cameras to keep bus lanes clear – transparency can help build trust in the system
  41. The Druze are a tightly knit community – and the violence in Syria is triggering fears in Lebanon
  42. EPA removal of vehicle emissions limits won’t stop the shift to electric vehicles, but will make it harder, slower and more expensive
  43. A red meat allergy from tick bites is spreading – and the lone star tick isn’t the only alpha-gal carrier to worry about
  44. Why leisure matters for a good life, according to Aristotle
  45. When it comes to finance, ‘normal’ data is actually pretty weird
  46. Football and faith could return to the Supreme Court – this time, over loudspeakers
  47. Survivors’ voices 80 years after Hiroshima and Nagasaki sound a warning and a call to action
  48. National parks are key conservation areas for wildlife and natural resources
  49. The case that saved the press – and why Trump wants it gone
  50. For America’s 35M small businesses, tariff uncertainty hits especially hard