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Why you need more Vitamin D in the winter

  • Written by Margherita T. Cantorna, Distinguished Professor of Molecular Immunology, Pennsylvania State University
Vitamin D is sometimes called the sunshine vitamin. FotoHelin/Shutterstock.com

Winter is upon us and so is the risk of vitamin D deficiency and infections. Vitamin D, which is made in our skin following sunlight exposure and also found in oily fish (mackerel, tuna and sardines), mushrooms and fortified dairy and nondairy substitutes, is essential...

Read more: Why you need more Vitamin D in the winter

Why do onions make you cry?

  • Written by Minda Daughtry, Extension Agency, Agriculture – Horticulture, North Carolina State University
Need a handkerchief?Num LP Photo/Shutterstock

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 onions make you cry? – Dana L., age 12, Belmont, Massachusetts

Onions are grown and used all over the world, and anyone who has cut...

Read more: Why do onions make you cry?

What do we want? Unbiased reporting! When do we want it? During protests!

  • Written by Danielle K. Kilgo, Assistant Professor, Indiana University
Without reporters amplifying their message, Black Lives Matter protesters have to do the job themselves. Justin Sullivan/Getty Images

The new decade is just days old, but in one respect it is already shaping up like the last one: with mass protests around the world.

Rallies for democracy overseas and anti-war demonstrations in the U.S. come on the...

Read more: What do we want? Unbiased reporting! When do we want it? During protests!

US-China trade pact President Trump just signed fails to resolve 3 fundamental issues

  • Written by Penelope B. Prime, Clinical Professor of International Business, Georgia State University
President Donald Trump shakes hands with Chinese Vice Premier Liu He after signing the trade agreement.AP Photo/Evan Vucci

U.S. President Donald Trump signed a trade deal with China on Jan. 15 intended as a first phase toward a more comprehensive agreement between the two countries.

In exchange for some tariff relief, China promised to buy an...

Read more: US-China trade pact President Trump just signed fails to resolve 3 fundamental issues

Russia's cabinet resigns and it's all part of Putin's plan

  • Written by Regina Smyth, Associate Professor of Political Science, Indiana University
Russian President Vladimir Putin (L) and now-former Prime Minister Dmitry Medvedev (R) in Sochi, Russia, Dec. 7, 2019. Mikhail Svetlov/Getty Images

Editor’s note: Russia’s prime minister, Dmitry A. Medvedev, and cabinet resigned on Jan. 15.

Russian politics are often not what they seem, especially to those in the West. We asked Regina...

Read more: Russia's cabinet resigns and it's all part of Putin's plan

Screen time: Conclusions about the effects of digital media are often incomplete, irrelevant or wrong

  • Written by Byron Reeves, Professor of Communication, Stanford University
Humans are barraged by digital media 24/7. Is it a problem?Bruce Rolff/Shutterstock.com

There’s a lot of talk about digital media. Increasing screen time has created worries about media’s impacts on democracy, addiction, depression, relationships, learning, health, privacy and much more. The effects are frequently assumed to be huge,...

Read more: Screen time: Conclusions about the effects of digital media are often incomplete, irrelevant or...

What Iranians think of the US and their own government

  • Written by Monti Datta, Associate Professor of Political Science, University of Richmond
Protesters during a demonstration in front of the British Embassy in Tehran, Iran on Jan. 12.AP Photo/Ebrahim Noroozi

After the Trump administration killed Iranian General Qassem Soleimani with a drone strike on Jan. 3, anti-American protests in Iran subsequently spiked, with thousands mourning Soleimani’s passing.

As someone who studies the...

Read more: What Iranians think of the US and their own government

Supreme Court DACA decision isn't just about Dreamers -- it's about whether the White House has to tell the truth

  • Written by Morgan Marietta, Associate Professor of Political Science, University of Massachusetts Lowell
Immigration rights advocates rally outside Supreme Court.Saul Loeb/AFP via Getty Images

The fate of 700,000 people facing deportation may hang on a new question facing the U.S. Supreme Court: Is the White House legally obligated to tell the whole truth when justifying its actions?

In November, justices heard arguments over the...

Read more: Supreme Court DACA decision isn't just about Dreamers -- it's about whether the White House has to...

Who is born a US citizen?

  • Written by Carol Nackenoff, Richter Professor of Political Science, Swarthmore College
Some people are U.S. citizens at birth, like this baby born in California.Joseph Sohm/Shutterstock.com

A recent court ruling about faraway American Samoa may have profound implications for a conflict that’s been going on for nearly 200 years: who gets to be an American citizen.

Debates over who gets citizenship and what kind of citizenship...

Read more: Who is born a US citizen?

An old debate over religion in school is opening up again

  • Written by David Mislin, Assistant Professor of Intellectual Heritage, Temple University
A Bible class at a public high school in Georgia,AP Photo/David Goldman

As the 2020 election approaches in the United States, President Donald Trump is adding school prayer to the list of contentious issues up for debate. At a rally in early January he announced plans to “safeguard students’ and teachers’ First Amendment rights to...

Read more: An old debate over religion in school is opening up again

More Articles ...

  1. Meet the narwhal, 'unicorn of the sea'
  2. Why fitness trackers may not give you all the 'credit' you hoped for
  3. 3 quotes that defined the first Democratic debate of 2020
  4. Earthquake forecast for Puerto Rico: Dozens more large aftershocks are likely
  5. Worrying about being drafted doesn't mean you're disloyal – it's an old American tradition
  6. Parental leave laws are failing single parents
  7. How Prohibition changed the way Americans drink, 100 years ago
  8. 'Uncut Gems' celebrates Manhattan’s Diamond District, a neighborhood that's a window into the past
  9. Think twice before shouting your virtues online – moral grandstanding is toxic
  10. Being copycats might be key to being human
  11. Microwaving sewage waste may make it safe to use as fertilizer on crops
  12. Heading into Iowa: Where do the Democratic candidates stand on health care coverage?
  13. Why the US-Iran conflict isn’t driving oil prices higher – and why it probably should
  14. Can the Constitution stop the government from lying to the public?
  15. The secret origins of presidential polling
  16. What US election officials could learn from Australia about boosting voter turnout
  17. High-priced specialty drugs: Exposing the flaws in the system
  18. Pope ends a secrecy rule for Catholic sexual abuse cases, but for victims many barriers to justice remain
  19. Restricting trade in endangered species can backfire, triggering market booms
  20. Why hip-hop belongs in today's classrooms
  21. Brexit could spell the end of globalization, and the global prosperity that came with it
  22. Cyberspace is the next front in Iran-US conflict – and private companies may bear the brunt
  23. Why are there seven days in a week?
  24. Weinstein jurors must differentiate between consent and compliance – which research shows isn't easy
  25. Large turnouts for Soleimani’s funeral in Iran carry powerful collective emotions – just as Americans saw during the colonial era
  26. Killing of Soleimani evokes dark history of political assassinations in the formative days of Shiite Islam
  27. Why some public universities get to keep their donors secret
  28. The made-up crisis behind the state takeover of Houston's public schools
  29. We're living in the bizarre world that Flaubert envisioned
  30. Your blood type may influence your vulnerability to norovirus, the winter vomiting virus
  31. Why we are hard-wired to worry, and what we can do to calm down
  32. 3D printing of body parts is coming fast – but regulations are not ready
  33. Matching Vietnamese brides with Chinese men, marriage brokers find good business – and sometimes love
  34. Rotting feral pig carcasses teach scientists what happens when tons of animals die all at once, as in Australia's bushfires
  35. Trump, like Obama, tests the limits of presidential war powers
  36. The US-Iran conflict and the consequences of international law-breaking
  37. School closures can hit rural communities hard
  38. What Trump's tweet threatening Iran's cultural sites could mean for Shiite Muslims
  39. Tweets about cannabis' health benefits are full of mistruths
  40. How countries in conflict, like Iran and the US, still talk to each other
  41. Children of color already make up the majority of kids in many US states
  42. Should college funding be tied to how many students graduate?
  43. Telecommuters create positive change – so why aren't employers more flexible about people working from home?
  44. Monkeys smashing nuts with stones hint at how human tool use evolved
  45. Trump asks NATO allies for help with Iran after years of bashing the alliance
  46. What happens when community college is made free
  47. For linguists, it was the decade of the pronoun
  48. Moving Bureau of Land Management headquarters to Colorado won't be good for public lands
  49. What did the Romans do in the year 0? A fake theologian explains
  50. I'm an OB/GYN who attended thousands of deliveries before wondering why Americans give birth in bed