For example, if you punch a bag full of water (like you would carry for hiking), the water within it will flow away from the point of impact. If the bag were full of an auxetic foam when you punched ...

Andy Alderson works for Sheffield Hallam University. His research into auxetic materials over the last twenty five years has received funding from relevant UK and overseas government funding agencies ...

Most of us think we have a pretty solid grasp on basic physics, and one of the assumptions we've come to form is that any material gets thinner as it's stretched. It makes sense, since the same amount ...

Imagine pulling on the long ends of a rectangular piece of rubber. It should become narrower and thinner. But what if, instead, it got wider and fatter? Now, push in on those same ends. What if the ...

The risk of injury in professional sport has been a central feature in recent debates about how well protected our stars are. Only recently, Argentine football player Emanuel Ortega died of a fatal ...