### Hackers begone: Measurement-device-independent QKD increases clock rate and transmission distance while reducing failure

(Phys.org)—In the ongoing effort to make communications secure, Quantum Key Distribution (QKD) theoretically provides a solution – but to the delight of increasingly sophisticated hackers, falls short ...

### Physicists study magnetism with the roles of position and momentum reversed

(Phys.org) —Normally, the strength of a magnetic field increases as you get closer to a magnet and decreases as you move further away—a concept easily understood when placing magnets near a refrigerator, ...

### Mathematicians calculate that there are 177,147 ways to knot a tie

(Phys.org) —A small team of mathematicians, led by Mikael Vejdemo-Johansson of the of the KTH Royal Institute of Technology in Stockholm, has uploaded a paper to the preprint server arXiv describing a math ...

### Wrinkle predictions: New mathematical theory may explain patterns in fingerprints, raisins, and microlenses

As a grape slowly dries and shrivels, its surface creases, ultimately taking on the wrinkled form of a raisin. Similar patterns can be found on the surfaces of other dried materials, as well as in human fingerprints. ...

### Fluid mechanics suggests alternative to quantum orthodoxy

The central mystery of quantum mechanics is that small chunks of matter sometimes seem to behave like particles, sometimes like waves. For most of the past century, the prevailing explanation of this conundrum ...

### Study using OpenStreetMap and mathematics reveals there are only four unique city topologies

(Phys.org) —A pair of researchers, a physicist and a mathematician, has used data from OpenStreetMap and mathematical analysis to come up with the idea that there are only four main types of city topologies. ...

### Proving uncertainty: First rigorous formulation supporting Heisenberg's famous 1927 principle

Nearly 90 years after Werner Heisenberg pioneered his uncertainty principle, a group of researchers from three countries has provided substantial new insight into this fundamental tenet of quantum physics ...

### Computer generated math proof is too large for humans to check

(Phys.org) —A pair of mathematicians, Alexei Lisitsa and Boris Konev of the University of Liverpool, U.K., have come up with an interesting problem—if a computer produces a proof of a math problem that ...

### Granular model explains unusual behavior in sand

From a mechanical perspective, granular materials are stuck between a rock and a fluid place, with behavior resembling neither a solid nor a liquid. Think of sand through an hourglass: As grains funnel through, ...

### Researchers use math and observation to show neural networks in crustaceans have evolved to offer optimized swimming

### Bovine TB infection depends on feedback between cattle and badgers

Bovine tuberculosis (BTB) is an infectious disease affecting cattle and badgers. New research from the Universities of Bristol and Cambridge has found that BTB is most likely to be nearly under control in ...

### From the depths of a microscopic world, spontaneous cooperation

Maybe it's not such a dog-eat-dog world after all. A clever combination of two different types of computer simulations enabled a group of Illinois researchers to uncover an unexpectedly cooperative group ...

### Soap films with complex shapes shed light on the formation of mathematical singularities (w/ Video)

(Phys.org) —Soap films with complex shapes shed light on the formation of mathematical singularities, which occur in a broad range of fields.

### Hunt for an 'unidentified electron object'

New research sheds light on the nature of 'unidentified electron objects'—a mysterious class of objects that exists in superfluid helium at low temperature.