Lee Zeldin, the E.P.A. administrator, revived a plan created during the first Trump administration to end the testing of ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

For thousands of years, humans have studied animals’ bodies to better understand our own. But using other animals as a proxy for humans is far from perfect. There are ethical issues for one, and they ...