Laser physics: At the pulse of a light wave

Physicists in the Laboratory for Attosecond Physics at Ludwig-Maximilians-Universitaet (LMU) in Munich and at the Max Planck Institute for Quantum Optics (MPQ) have developed a novel type of detector that enables the oscillation ...

That public playground is good for your kids and your wallet

If you live near a public playground it can be a convenient outdoor destination for short excursions and a life-saving source of pressure relief when the kids are too surly to bear inside the house. But in research, published ...

Finding Nemo's cousins

The fish made famous in Finding Nemo can see ultraviolet (UV) light and may use it as a 'secret channel' to find both friends and food, according to researchers.

Dorian's floodwaters trap people in attics in North Carolina

A weakened Hurricane Dorian flooded homes on North Carolina's Outer Banks on Friday with a ferocity that took even storm-hardened residents by surprise, forcing people to retreat to their attics. Hundreds were feared trapped ...

Mathematicians develop new statistical indicator

Most of us know this phenomenon only too well: when it's hot outside, you feel the urge for a cooling ice cream. But would you have thought that mathematics could be involved?

Opinion: Hitting turbulence? Aviation and the climate crisis

In the U.K., there is a legal commitment to reducing the net carbon account for all six greenhouse gases by 80 percent (1990-2050) under the Climate Change Act 2008, and recently this target has been raised to 100 percent. ...

Can we still have fun if the UK goes carbon neutral?

Will Britain going carbon neutral mean no more fun? Experts from the University of Surrey have urged local policy makers to put in place infrastructure that will enable people to enjoy recreation and leisure while keeping ...

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Distance

Distance (or farness) is a numerical description of how far apart objects are. In physics or everyday discussion, distance may refer to a physical length, or an estimation based on other criteria (e.g. "two counties over"). In mathematics, a distance function or metric is a generalization of the concept of physical distance. A metric is a function that behaves according to a specific set of rules, and provides a concrete way of describing what it means for elements of some space to be "close to" or "far away from" each other.

In most cases, "distance from A to B" is interchangeable with "distance between B and A".

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