Researchers have been trying various techniques to determine Twitter user’s location even where they don’t purposefully give it away.

# 21 SCIENTIFIC AND TECHNICAL ACHIEVEMENTS TO BE HONORED WITH ACADEMY AWARDS®

The question is deceptively simple: Given a geometric space — a sphere, perhaps, or a doughnut-like torus — is it possible to divide it into smaller pieces?

Wave equations help describe waves of light, sound and water as they occur in physics. Also known as partial differential equations, or PDEs, they have valuable potential for predicting weather or earthquakes, or certain types of natural disasters...