Viruses are the ultimate freeloaders. The best among them — influenza, smallpox and SARS-CoV-2 — spread easily among human hosts while delivering high mortality...

The search for the many factors related to the development of Alzheimer’s goes on, and now there’s a new prospect: serotonin.

Lewis Carroll may have written a fairy tale, but some people have the symptoms he described.

Access to the internet with thousands of respondents doesn’t seem to be the only thing causing mental health issues with teens.