b\), the following diagram shows the main properties: If k > 0, the vertex is a minimum turning point If k < 0, the vertex is a maximum turning point We can identify these properties from a ...

Alzheimer’s disease can also sometimes severely impair executive function to a point where a person may no longer be able to drive, get dressed, or behave appropriately in social situations.

Paul M. Sutter is an astrophysicist at SUNY Stony Brook and the Flatiron Institute, host of Ask a Spaceman and Space Radio, and author of How to Die in Space. Sutter contributed this article to ...