It doesn’t actually exist, but plenty of drugs are purported to ferret out the facts. These methods, sometimes used in law enforcement, raise scientific and ethical questions. ...read more
Some parts of the human brain shrink as the weather turns colder and days grow shorter. But don't panic — scientists have a few theories why. ...read more
The Pfizer-BioNTech COVID-19 vaccine is the agency’s fastest approval ever — here’s how it was accomplished without shortchanging safety standards. ...read more