NewsPronto

 
Men's Weekly

.

USA Conversation

The Conversation USA

The Conversation USA

How many _Tyrannosaurus rex_ walked the Earth?

  • Written by Ashley Poust, Research Associate in Paleontology, University of California, Berkeley
image_Tyrannosaurus rex_ spanned all of ancient North America, and about 20,000 lived at once.1Ado123/Wikimedia Commons, CC BY-SA

The Research Brief is a short take about interesting academic work.

The big idea

During 2.4 million years of existence on Earth, a total of 2.5 billion Tyrannosaurus rex ever lived, and 20,000 individual animals would have been...

Read more: How many _Tyrannosaurus rex_ walked the Earth?

More Articles ...

  1. Cuba's economic woes may fuel America's next migrant crisis
  2. You're not imagining it – 3 ways COVID-19 has been extra hard on American parents
  3. Fatal police violence may be linked to preterm births in neighborhoods nearby
  4. America goes back to school – 5 essential reads on parenting in the pandemic
  5. I’m a pediatrician who cares for transgender kids – here’s what you need to know about social support, puberty blockers and other medical options that improve lives of transgender youth
  6. 6 ways recent college graduates can enhance their online job search
  7. 80% of fatal e-scooter crashes involve cars – new study reveals where and why most collisions occur
  8. As extreme fires transform Alaska's boreal forest, deciduous trees put a brake on carbon loss and how fast the forest burns
  9. Prolonged brain dysfunction in COVID-19 survivors: A pandemic in its own right?
  10. French row over mosque isn't simply about state financing – it runs deep into Islamophobia and French secularism
  11. How Baptists hold differing views on the resurrection of Christ and why this matters
  12. What former foster children went through when the COVID-19 pandemic closed college campuses
  13. Scientists are on a path to sequencing 1 million human genomes and use big data to unlock genetic secrets
  14. Why Wall Street investors' trading California water futures is nothing to fear – and unlikely to work anyway
  15. Nearly 60 million Americans don't drink their tap water, research suggests – here's why that's a public health problem
  16. Infrastructure? Or jobs? Controversy over name of Biden proposal highlights long tradition in politics
  17. The rise of female UFC fighters obscures profound exploitation, inequality
  18. How to get COVID-19 vaccines to poor countries – and still keep patent benefits for drugmakers
  19. Colombia gives nearly 1 million Venezuelan migrants legal status and right to work
  20. COVID-19 public health messages have been all over the place – but researchers know how to do better
  21. Trump, defying custom, hasn't given the National Archives records of his speeches at political rallies
  22. Compassionate courage moves beyond 'cancel culture' to challenge systemic racism – but it's hard work
  23. 'Deprogramming' QAnon followers ignores free will and why they adopted the beliefs in the first place
  24. Is magic immoral? It played a role in the development of early Christianity
  25. Knoxville school shooting serves as stark reminder of a familiar – but preventable – threat
  26. Plants thrive in a complex world by communicating, sharing resources and transforming their environments
  27. US postpones Afghanistan troop withdrawal in hopes of sustaining peace process: 5 essential reads
  28. The EU wants a carbon tax on imports – but would it be the climate solution officials expect?
  29. Johnson Johnson vaccine suspension – a doctor explains what this means for you
  30. 143,518 US public library workers are keeping their communities informed, connected and engaged – but their jobs may be at risk
  31. How race-related stress could be driving educators of color away from the job
  32. One change that could help nursing homes recover from COVID-19 fears and become safer places for aging parents
  33. Why student athletes need a new playbook to stay safe in the COVID-19 era
  34. How 'complementarianism' – the belief that God assigned specific gender roles – became part of evangelical doctrine
  35. Long live the monarchy! British royals tend to survive a full three decades longer than their subjects
  36. How the Supreme Court found its faith and put 'religious liberty' on a winning streak
  37. We're creating 'humanized pigs' in our ultraclean lab to study human illnesses and treatments
  38. Polen puede aumentar el riesgo de contraer COVID-19, ya sea que tengas alergias o no, según estudio
  39. A nutrition report card for Americans: Dark clouds, silver linings
  40. Astrocyte cells in the fruit fly brain are an on-off switch that controls when neurons can change and grow
  41. Derek Chauvin trial: 3 questions America needs to ask about seeking racial justice in a court of law
  42. Northern Ireland, born of strife 100 years ago, again erupts in political violence
  43. How many states and provinces are in the world?
  44. MLB's decision to drop Atlanta highlights the economic power companies can wield over lawmakers – when they choose to
  45. What inspired digital nomads to flee America's big cities may spur legions of remote workers to do the same
  46. Write ill of the dead? Obits rarely cross that taboo as they look for the positive in people's lives
  47. Proof of new physics from the muon's magnetic moment? Maybe not, according to a new theoretical calculation
  48. Pandemic recovery will take more than soaring growth – to fuel a more equitable economy, countries need to measure the well-being of people, too
  49. At what age are people usually happiest? New research offers surprising clues
  50. 3 ways music educators can help students with autism develop their emotions