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The term “epidemic” is now being used for more than infectious diseases. So what does it actually mean? AAPONE/Ahmed Jallanzo/

From plagues to obesity: how epidemics have evolved

The obesity epidemic, the flu epidemic, the opioid epidemic… in the 21st century, everything seems to be an “epidemic”. But what does the term actually mean?
When cars, trucks, bikes and pedestrians come together at an intersection, design makes the difference between collisions and safety. pxhere

We can design better intersections that are safer for all users

Collisions at intersections between motor vehicles, cyclists and pedestrians cause many deaths and injuries. Design that considers how each group approaches intersections improves everyone’s safety.
In the Back to the Future movies, the DeLorean car was able to travel through time thanks to a flux capacitor. Wikimedia/Oto Godfrey and Justin Morton

We’ve designed a ‘flux capacitor’, but it won’t take us Back to the Future

Physicists have designed an electrical component that breaks time-reversal symmetry. Not quite the time machine from Hollywood but it should help with communication technology and quantum computing.
The settings on traffic lights make pedestrians wait longer by giving higher priority to vehicle traffic. Abaconda Management Group/Wikimedia

How traffic signals favour cars and discourage walking

Everyone doesn’t simply wait their turn at traffic lights. Signals are set up to enable a ‘green wave’ for cars and adjust to heavy traffic, making walkers wait longer no matter how many there are.