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Why do people have baby teeth and adult teeth?

  • Written by Christina Nicholas, Associate Professor of Orthodontics and of Anthropology, University of Illinois Chicago

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com.

Why do people have two sets of teeth? – Ivy D., age 11, Hyde Park, New York

Teeth help animals bite and chew food. Meat-eating carnivores tend to have sharp teeth to sink into their prey,...

Read more: Why do people have baby teeth and adult teeth?

Turning motion into medicine: How AI, motion capture and wearables can improve your health

  • Written by Azarang Asadi, Data Scientist, Oklahoma State University
imageThe use of motion data is expanding from fitness and rehabilitation to general health.Todor Tsvetkov/E+ via Getty Images

People often take walking for granted. We just move, one step after another, without ever thinking about what it takes to make that happen. Yet every single step is an extraordinary act of coordination, driven by precise timing...

Read more: Turning motion into medicine: How AI, motion capture and wearables can improve your health

Allen Iverson’s 2001 Sixers embodied Philly’s brash, gritty soul − and changed basketball culture forever

  • Written by Jared Bahir Browsh, Assistant Teaching Professor of Critical Sports Studies, University of Colorado Boulder

It’s unusual for a professional sports franchise to plan a yearlong celebration for a team that didn’t win a championship.

But it is also rare that a group of players represents the vibe and culture of a city so accurately as the Philadelphia 76ers did back in 2001.

Throughout the 2025-2026 NBA season, the Sixers will honor the 25th...

Read more: Allen Iverson’s 2001 Sixers embodied Philly’s brash, gritty soul − and changed basketball culture...

What AI earbuds can’t replace: The value of learning another language

  • Written by Gabriel Guillén, Professor of Language Studies, Middlebury College
imageBeing able to follow and contribute to a live group conversation is the gold standard of language learning.Zinkevych/iStock via Getty Images

Your host in Osaka, Japan, slips on a pair of headphones and suddenly hears your words transformed into flawless Kansai Japanese. Even better, their reply in their native tongue comes through perfectly clear...

Read more: What AI earbuds can’t replace: The value of learning another language

Trump was already cutting low-income energy assistance – the shutdown is making things worse as cold weather arrives

  • Written by Conor Harrison, Associate Professor of Economic Geography, University of South Carolina
imageHome heating oil, used in furnaces across the Northeast, is expensive, leading some people to keep homes at unhealthy temperatures.AP Photo/Charles Krupa

As fall turns to winter and temperatures begin to drop, millions of people across the U.S. will struggle to pay their rising energy bills. The government shutdown is making matters even worse:...

Read more: Trump was already cutting low-income energy assistance – the shutdown is making things worse as...

James Watson exemplified the best and worst of science – from monumental discoveries to sexism and cutthroat competition

  • Written by Andor J. Kiss, Director of the Center for Bioinformatics and Functional Genomics, Miami University
imageJames Watson was both a towering and controversial figure in science.Gerhard Rauchwetter/picture alliance via Getty Images

James Dewey Watson was an American molecular biologist most known for co-winning the 1962 Nobel Prize in physiology or medicine for discovering the structure of DNA and its significance in transferring information in living...

Read more: James Watson exemplified the best and worst of science – from monumental discoveries to sexism and...

What to know as hundreds of flights are grounded across the US – an air travel expert explains

  • Written by Laurie A. Garrow, Professor of Civil and Environmental Engineering, Georgia Institute of Technology
imagePassengers walk through the Ronald Reagan Washington National Airport on Nov. 7, 2025.Anna Moneymaker/Getty Images

Major airports across the United States were subject to a 4% reduction in flights on Nov. 7, 2025, as the government shutdown began to affect travelers.

The move by the Federal Aviation Administration is intended to ease pressure on air...

Read more: What to know as hundreds of flights are grounded across the US – an air travel expert explains

National 211 hotline calls for food assistance quadrupled in a matter of days, a magnitude typically seen during disasters

  • Written by Matthew W. Kreuter, Kahn Family Professor of Public Health, Washington University in St. Louis
imageSharp spikes in calls for food assistance are rare outside of natural disasters.AP Photo/Eric Gay

Between January and mid-October 2025, calls to local 211 helplines from people seeking food pantries in their community held steady at nearly 1,000 calls per day.

But as the government shutdown entered its fourth week in late October, states began to...

Read more: National 211 hotline calls for food assistance quadrupled in a matter of days, a magnitude...

Seashells from centuries ago show that seagrass meadows on Florida’s Nature Coast are thriving

  • Written by Michal Kowalewski, Thompson Chair of Invertebrate Paleontology, University of Florida
imageSeagrass meadows are an essential part of Florida's coastal ecosystem.Jenny Adler

During a day at the beach, it’s common to see people walking up and down the shore collecting seashells.

As a paleontologist and marine ecologist, we look at shells a bit differently than the average beachcomber. Most people dig up shells in the sand and see...

Read more: Seashells from centuries ago show that seagrass meadows on Florida’s Nature Coast are thriving

Pennsylvania counties face tough choices on spending $2B opioid settlement funds

  • Written by Halie Kampman, Postdoctoral Scholar in the Department of Geography, Penn State
imageIn Pennsylvania, local governments will decide which substance use programs to fund in their communities.Jeff Fusco/The Conversation U.S., CC BY-SA

In communities across Pennsylvania, local officials are deciding how to spend over US$2 billion dollars from the state’s opioid settlement agreements.

For many, the task is proving promising yet...

Read more: Pennsylvania counties face tough choices on spending $2B opioid settlement funds

More Articles ...

  1. FDA recall of blood pressure pills due to cancer-causing contaminant may point to higher safety risks in older generic drugs
  2. Always watching: How ICE’s plan to monitor social media 24/7 threatens privacy and civic participation
  3. House speaker’s refusal to seat Arizona representative is supported by history and law
  4. Overwhelm the public with muzzle-velocity headlines: A strategy rooted in racism and authoritarianism
  5. Who gets SNAP benefits to buy groceries and what the government pays for the program – in 5 charts
  6. AI could worsen inequalities in schools – teachers are key to whether it will
  7. Anxiety over school admissions isn’t limited to college – parents of young children are also feeling pressure, some more acutely than others
  8. Supreme Court soon to hear a religious freedom case that’s united both sides of the church-state divide
  9. Chatbots don’t judge! Customers prefer robots over humans when it comes to those ’um, you know’ purchases
  10. Brewery waste can be repurposed to make nanoparticles that can fight bacteria
  11. The unraveling of workplace protections for delivery drivers: A tale of 2 workplace models
  12. Why does your doctor seem so rushed and dismissive? That bedside manner may be the result of the health care system
  13. How to keep dementia from robbing your loved ones of their sense of personhood – tips for caregivers
  14. Trump’s White House renovations fulfill Obama’s prediction, kind of
  15. A brief history of congressional oversight, from Revolutionary War financing to Pam Bondi
  16. How the US cut climate-changing emissions while its economy more than doubled
  17. Why people don’t demand data privacy – even as governments and corporations collect more personal information
  18. HIV knows no borders, and the Trump administration’s new strategy leave Americans vulnerable – an HIV-prevention expert explains
  19. Customers can become more loyal if their banks solve fraud cases, researchers find
  20. The beauty backfire effect: Being too attractive can hurt fitness influencers, new research shows
  21. Bad Bunny and Puerto Rican Muslims: How both remix what it means to be Boricua
  22. The White Stripes join the Rock Roll Hall of Fame − their primal sound reflects Detroit’s industrial roots
  23. China’s new 5-year plan: A high-stakes bet on self-reliance that won’t fix an unbalanced economy
  24. Zohran Mamdani’s transformative child care plan builds on a history of NYC social innovations
  25. Dick Cheney’s expansive vision of presidential power lives on in Trump’s agenda
  26. Declining union membership could be making working-class Americans less happy and more susceptible to drug overdoses
  27. Singles’ Day is a $150B holiday in China. Here’s why I think ‘11/11’ will catch on in the US
  28. Diane Keaton’s $5M pet trust would be over the top if reports prove true – here’s how to ensure your beloved pet is safe after you are gone
  29. Oklahoma tried out a test to ‘woke-proof’ the classroom. It was short-lived, but could still leave a mark
  30. America’s teachers are being priced out of their communities − these cities are building subsidized housing to lure them back
  31. SETI’s ‘Noah’s Ark’ – a space historian explores how the advent of radio astronomy led to the USSR’s search for extraterrestrial life
  32. 2 ways you can conserve the water used to make your food
  33. Congress has been dodging responsibility for tariffs for decades – now the Supreme Court will decide how far presidents can go alone
  34. Signatures meant more in Mesopotamia than they do now − what cylinder seals say about ancient and modern life
  35. Trump is changing student loan forgiveness rules – barring some public workers from getting relief, but resuming it for others
  36. Strict school vaccine mandates work, and parents don’t game the system − new research
  37. Amateur hour in Congress: How political newcomers fuel gridlock and government shutdowns
  38. The military’s diversity rises out of recruitment targets, not any ‘woke’ goals
  39. Why can’t every country get along with each other? It comes down to resources, inequality and perception
  40. Private equity firms are snapping up mobile home parks − and driving out the residents who can least afford to lose them
  41. Investors prefer ‘I’ over ‘we’ when CEOs apologize
  42. Bangladesh’s accession to the UN Water Convention has a ripple effect that could cause problems with India
  43. All government shutdowns disrupt science − in 2025, the consequences extend far beyond a lapse in funding
  44. Trump’s squeeze of Venezuela goes beyond Monroe Doctrine – in ideology, intent and scale, it’s unprecedented
  45. Trump’s squeeze of Venezuela goes beyond ‘Monroe doctrine’ – in ideology, intent and scale, it’s unprecedented
  46. The shutdown – and the House’s inaction – helps pave Congress’ path to irrelevance
  47. ‘Only death can protect us’: How the folk saint La Santa Muerte reflects violence in Mexico
  48. What is DNS? A computer engineer explains this foundational piece of the web – and why it’s the internet’s Achilles’ heel
  49. Symbolism of cemetery plants: How flowers, trees and other botanical motifs honor those buried beneath
  50. Wildlife recovery means more than just survival of a species