Engineering

'Garbatrage' spins e-waste into prototyping gold

To Ilan Mandel, a Cornell robotics researcher and builder, the math didn't add up. How could a new, off-the-shelf hoverboard cost less than the parts that compose it?

Electronics & Semiconductors

Taiwan chip giant TSMC says Arizona plant making 'fast progress'

Taiwan chip giant TSMC's planned factory in the United States was making "fast progress", the company's chairman said Wednesday, despite it facing a delayed start due to worker shortages and reported union disputes.

Computer Sciences

Evolutionary computation for expensive optimization: A survey

The term 'Expensive optimization problem' (EOP) refers to any problem that requires expensive or even unaffordable costs to evaluate candidate solutions. These problems exist in many significant real-world applications.

Business

Paris says tough Airbnb rules 'working' as violations fall

The city of Paris said on Monday that its tough restrictions on the online accommodation service Airbnb were working, pointing to fewer violations of the code this year in the French capital but stiffer fines.

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City

A city is a relatively large and permanent settlement, particularly a large urban settlement. Although there are no agreed on technical definitions distinguishing a city from a town within general English language meanings, many cities have a particular administrative, legal, or historical status based on local law — for example an article of incorporation approved by the local cognizant (state) legislature separates towns from city government forms, rights, duties and privileges in Massachusetts — similar distinctions are made across the world, particularly in former colonies of the United Kingdom. Historically, in Europe, a city was understood to be an urban settlement with a cathedral; in later usages, especially in the United Kingdom and parts of Commonwealth of Nations, a city was a settlement with a royal charter.

Cities generally have advanced systems for sanitation, utilities, land usage, housing, and transportation and more. This proximity greatly facilitates interaction between people and businesses, benefiting both parties in the process.

A big city, or metropolis, may have suburbs and regions. Such cities are usually associated with metropolitan areas and urban sprawl, creating large numbers of business commuters. Once a city sprawls far enough to reach another city, this region can be deemed a conurbation or megalopolis.

This text uses material from Wikipedia, licensed under CC BY-SA