President Trump signed an executive order banning federal funding for ‘gain of function’ research. Scientists are split on whether these virus experiments are essential or too risky to continue.

Calculus is the study of change. It is a branch of mathematics focused on limits, functions, derivatives, integrals, and infinite series. This page is an overview or introduction to calculus. Watch ...

The bill would bar any federal agencies from funding so-called gain-of-function research, which involves altering a pathogen to study its spread, potentially making it more transmissible or severe ...