Avion Simon and his siblings, C.J., and Momo, lost their mother to Covid-19. Science has some ideas about the health hurdles that Covid orphans could face in the future.

A look at how a bias on body size affects care of heavier patients, something the medical community is beginning to recognize, and do something about.

Biased ideas about a link between body size and health have led many people to dismiss unexpected scientific findings.

Like cigarette manufacturers decades ago, e-cigarette makers have pitched their products as fun and safe. But nobody knows what the risks are.

After past outbreaks, workers with proof of antibodies were in demand. But history urges caution.

Dr. Larry Brilliant, who helped eradicate smallpox, says past epidemics can teach us to fight coronavirus.

COVID-19 attacks the lungs. Past research shows that smoking and vaping may amplify the coronavirus.