Health
What Is a Placebo?
A placebo is an inactive treatment with no therapeutic effect of its own, used mainly in research. Here is what it is, the placebo effect, and why trials use it.
Topic
medicine
Science
What CRISPR gene editing can — and can’t — do
CRISPR lets scientists cut DNA at a chosen spot with unusual ease, but precision, delivery and ethics still bound what it can safely achieve.
