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Wildfire smoke traveling hundreds of miles caused hazy skies all the way to Virginia in 2023. AP Photo/Alex Brandon

Wildfire smoke is back – fires burning across Canada are already triggering US air quality alerts in the Midwest and Plains

States could be in for another summer of unhealthy wildfire smoke as ‘zombie fires’ resurface in western Canada and more blazes break out in the dry conditions.
The exam room of a women’s health clinic, which provides abortions, in Jacksonville, Fla., is seen in April 2024. Joe Raedle/Getty Images

Confusion over how pregnancy dates are measured is widespread – and makes for uninformed debate over abortion limits

Most Americans surveyed did not know how pregnancies are dated or how long a trimester is – but this is especially true among some groups, like people who say they support six-week abortion bans.
Iron carries oxygen throughout the body, but ironically, it can also make it harder to breathe for people with asthma. Hiroshi Watanabe/Stone via Getty Images

Iron fuels immune cells – and it could make asthma worse

Asthma attacks can result from immune cells overreacting to a harmless allergen. Tamping down iron levels in certain immune cells can help control their activity.
A march for climate action in St. Peter’s Square at the Vatican in June 2015. Pope Francis praised the participants, who included Christians, Muslims, Jews and Hindus. AP Photo/Andrew Medichini

Vatican conference on ‘climate resilience’ is the latest in a long line of environment initiatives by Pope Francis and the Catholic Church – 5 essential reads

Pope Francis and other Catholic leaders committed to raising awareness of environmental issues draw on centuries of tradition.
Canadian police and television reporters gather outside the rapper Drake’s Toronto mansion after a shooting there in May 2024. (Andrew Francis Wallace/Toronto Star via Getty Images

Rap ‘beef’ as public spectacle is a dangerous game that artists rarely win

Since rap’s emergence, artists have boasted about themselves in ways that were funny and sometimes violent, vulgar and sexist. The popularity of the music and its exploitation can be dangerous.
Fragments of Russian shells piled at a farm in the Chernihiv region of northern Ukraine. Volodymyr Tarasov /Ukrinform/Future Publishing via Getty Images

Wars cause widespread pollution and environmental damage − here’s how to address it in peace accords

War is wreaking havoc on land, water and critical infrastructure in Ukraine and Gaza. Two experts on peace and conflict explain how to include such impacts in peace agreements.
Biases against certain groups of people can escalate into acts of violence if left unchecked. Paul Taylor/Stone via Getty Images

Why do people hate people?

It can be easy to mistake feelings like fear and anger as hate. When biases are acted out in harmful ways, however, speaking up can help stop hate from getting worse.
Organoids can replicate each component of the human heart, from its chambers to its veins. Yonatan R. Lewis-Israeli et al. 2021/Nature Communications

Engineering mini human hearts to study pregnancy complications and birth defects

Human heart organoids allow researchers to study the developing heart while avoiding the ethical issues of using human embryos and the imperfections of animal models.