A leader pushes the envelope of what’s possible but keeps evaluating his or her progress. If you can envision the possible, ...

Background Sedentary behaviour is associated with impaired cognition, whereas exercise can acutely improve cognition. Objective We compared the effects of a morning bout of moderate-intensity exercise ...

The justices are generally reluctant to take account of a president’s public statements. But extensive quotes from Mr. Trump in a key filing may change the legal calculus. By Adam Liptak Kim Davis, a ...

Karlskrona is an outstanding example of a late-17th-century European planned naval city. The original plan and many of the buildings have survived intact, along with installations that illustrate its ...

Example: Imagine a square with a circle inscribed inside it. The blue shaded area is the region within the square but outside ...

Equipotential Surfaces: These are surfaces where the electric potential is constant. Electric field lines are always perpendicular to equipotential surfaces. Calculating the electric field at a given ...