What is fentanyl and why is it behind the deadly surge in US drug overdoses? A medical toxicologist explains
Only a small amount of fentanyl is enough to be lethal. AP Photo/Jacquelyn Martin Buying drugs on the street is
Countries with lower-than-expected vaccination rates show unusually negative attitudes to vaccines on Twitter
Social media sites like Twitter have been a major source of both true and false information regarding COVID-19 vaccines. MicroStockHub/iStock
What your eyes reveal about your health
Irina Bg/Shutterstock Scientists at the University of California, San Diego, have developed a smartphone app that can detect early signs
Nonprofit drugmaker Civica Rx is taking aim at the high insulin prices harming people with diabetes
High insulin prices are leaving some people who need the drug without access. Erik McGregor/LightRocket via Getty Images Doctors have
ADHD in adults is challenging but highly treatable – a clinical psychologist explains
ADHD wasn't recognized as a condition that can have profound effects on adults until the 1990s. SIphotography/iStock via Getty Images
The Catholic saint who dedicated his life to a leprosy colony in Hawaii – and became an inspiration for HIV/AIDS care
The headstone of Father Damien, a Catholic saint who was canonized in 2009. Richard A. Cooke III/Corbis Historical via Getty
Complex post-traumatic stress disorder explained
Stephanie Foo, an award-winning radio producer, suffers from complex post-traumatic stress disorder, a disorder that in her country (the US)
HRT crisis: what’s causing the shortages of menopause treatments?
Many thousands of women are struggling to obtain drugs. VH-Studio Thousands of women in the UK who use hormone replacement
New eye drops can help aging people see better – an optometrist explains how Vuity treats presbyopia
Nearly all people start to develop blurry vision once they hit their 40s and 50s. demaerre/iStock via Getty Images When
You’ve likely heard of the brain’s gray matter – here’s why the white matter is important too
The brain's neural network, which includes both gray and white matter. Pasieka/Science Photo Library via Getty Images Who has not