NewsPronto

 
The Times


.

USA Conversation

The Conversation USA

The Conversation USA

Fossil shark teeth are abundant and can date the past in a unique way

  • Written by Stephanie Killingsworth, Ph.D. Student in Geological Sciences, University of Florida
imageA paleontologist holds a megalodon fossil tooth. Kristen Grace/FLMNH, CC BY-SA

The ratios of strontium isotopes in fossil shark teeth can be used to better understand how coastal environments evolved in ancient times, according to our newly published work.

As paleontologists with the Florida Museum of Natural History, we’re interested in...

Read more: Fossil shark teeth are abundant and can date the past in a unique way

More Articles ...

  1. Rare portraits reveal the humanity of the slaves who revolted on the Amistad
  2. Your environment affects how well your medications work − identifying exactly how could make medicine better
  3. Where does black fall on the color spectrum? A color scientist explains
  4. The Black librarian who rewrote the rules of power, gender and passing as white
  5. Bogus scientific papers are enriching fraudsters and slowing lifesaving medical research
  6. Property and sovereignty in space − as countries and companies take to the stars, they could run into disputes
  7. Can a charter school be religious? The Supreme Court decision about St. Isidore, a Catholic school in Oklahoma, could redraw lines around church and state in education
  8. AI gives nonprogrammers a boost in writing computer code
  9. Teens on social media: Red, blue and purple states are all passing laws to restrict and protect adolescents
  10. Nonprofits that provide shelter for homeless people, disaster recovery help, and food for low-income Americans rely heavily on federal funding – they would be reeling if Trump froze that money
  11. From breakbeats to the dance floor: How hip-hop and house revolutionized music and culture
  12. How nonprofits abroad can fill gaps when the US government cuts off foreign aid
  13. Biden targeted the online right-wing terrorism threat − now it’s up to Trump
  14. A federal policy expert weighs in on Trump’s efforts to stifle gender-affirming care for Americans under 19
  15. How satellites and AI help fight wildfires today
  16. Why Trump’s meme coin is a cash grab
  17. Stricter abortion laws may cause increased infant deaths − 2 maternal and child health researchers explain the data
  18. ‘We painted our fear, hope and dreams’ − examining the art and artists of Guantánamo Bay
  19. Gen Z seeks safety above all else as the generation grows up amid constant crisis and existential threat
  20. Philly Whole Foods store becomes first to unionize – a labor expert explains what’s next and how Trump could stall workers’ efforts
  21. Bennu asteroid reveals its contents to scientists − and clues to how the building blocks of life on Earth may have been seeded
  22. Problematic Paper Screener: Trawling for fraud in the scientific literature
  23. Why building big AIs costs billions – and how Chinese startup DeepSeek dramatically changed the calculus
  24. Fake papers are contaminating the world’s scientific literature, fueling a corrupt industry and slowing legitimate lifesaving medical research
  25. Rest, reorientation and hope – the pillars of 2025’s Catholic Jubilee year
  26. President Carter had to balance employers’ demands for foreign workers with pressure to restrict immigration – and so does Trump
  27. Skin phantoms help researchers improve wearable devices without people wearing them
  28. Almost half of evicted women and families in metro Detroit say they were illegally pushed out of their homes
  29. ‘Aliens’ and ‘animals’ – language of hate used by Trump and others can be part of a violent design
  30. Robert F. Kennedy Jr.’s nomination signals a new era of anti-intellectualism in American politics
  31. What’s behind Trump’s flurry of executive action: 4 essential reads on autocrats and authoritarianism
  32. Commerce oversees everything from weather and salmon to trade and census − here are 3 challenges awaiting new secretary
  33. ¿Trump va en serio con cambiar el nombre del Golfo de México al ‘Golfo de América’? Esto explica una geógrafa
  34. Engineering the social: Students in this course use systems thinking to help solve human rights, disease and homelessness
  35. Medical research depends on government money – even a day’s delay in the intricate funding process throws science off-kilter
  36. In asking Trump to show mercy, Bishop Budde continues a long tradition of Christian leaders ‘speaking truth to power’
  37. St. Thomas Aquinas’ skull just went on tour − here’s what the medieval saint himself would have said about its veneration
  38. Disaster evacuations can take much longer than people expect − computer simulations could help save lives and avoid chaos
  39. Global wildlife trade is an enormous market – a look at the billions of animals the US imports from nearly 30,000 species
  40. Global wildlife trade is an enormous market – the US imports billions of animals from nearly 30,000 species
  41. Donors are down, but dollars are up – how US charitable giving is changing
  42. Canada and Greenland aren’t likely to join the US anytime soon – but ‘GrAmeriCa’ is a revealing thought experiment
  43. Getting mail to your door is just one part of what the postmaster general does
  44. Nutrition advice is rife with misinformation − a medical education specialist explains how to tell valid health information from pseudoscience
  45. Happiness in poorer countries does not follow the typical U-shaped curve − people are often happiest in middle age
  46. Federal threats against local officials who don’t cooperate with immigration orders could be unconstitutional − Justice Antonin Scalia ruled against similar plans
  47. I study democracy worldwide − here’s how Texas is eroding human rights, free expression and civil liberties
  48. Why does it hurt when you get a scrape? A neuroscientist explains the science of pain
  49. How does raw water compare to tap water? A microbiologist explains why the risks outweigh the benefits
  50. Why government can’t make America ‘healthier’ by micromanaging groceries purchased with SNAP benefits