Dear Carolyn: We have three grandsons around the same age (one by each of our three children). We love them all dearly. Two of our kids are pretty unashamed about asking us for regular babysitting and ...

It began as an ordinary night in a quiet South African town - two students driving home after spending time together. But in the shadows, four men waited for their chance. What followed was a violent ...

Encryption systems rely on “random” numbers, but conventional computers can’t generate them perfectly. New research shows that quantum physics can. By Alexander Nazaryan Researchers in Switzerland ...

Abstract: In this paper, we derive the distribution of a twodimensional (complex) random walk in which the angle of each step is restricted to a subset of the circle. This setting appears in various ...

Dimensional Fund Advisors is a research-driven investment firm based in Austin. It builds equity and fixed income strategies through ETFs, mutual funds, and managed accounts. The company’s global AUM ...

Circuits such as the design described here implement useful tools for a diversity of calibration and testing applications. A two-wire loop current generator is a useful tool for the testing, ...

A routine quantum optics technique just revealed an extraordinary secret: entangled light can carry incredibly complex topological structures. Researchers found these hidden patterns reach up to 48 ...

We all know we live in three-dimensional space. But what does it mean when people talk about four dimensions? Is it just a bigger kind of space? Is it "space-time," the popular idea which emerged from ...

More than 100 years ago Hungarian-born mathematician George Pólya found himself trapped in a loop of social awkwardness. A professor at the Swiss Federal Institute of Technology Zurich, he enjoyed ...

Abstract: In this paper, a new two-dimensional random switching frequency pulse-width-modulation (2D-RSF-PWM) method is proposed for variable frequency drives (VFDs). The proposed 2D-RSF-PWM method is ...