Enzymes are the molecular machines that power life; they build and break down molecules, copy DNA, digest food, and drive virtually every chemical reaction in our cells. For decades, scientists have ...

On Monday, May 12, former CDC Director Rochelle Walensky delivered the below commencement address at the WashU School of Medicine. One of my first tasks even before my tenure began as director of the ...

1. Climate science basics -- What is the greenhouse effect and how does it warm the Earth? -- Why are scientists so certain the climate system is warming? -- How does global warming increase sea ...