Nobody agrees on how to define a city. But the emergence of “natural cities” from social media data sets may change that, say computational geographers.
A powerful new search engine designed to help diagnose rare diseases could prove a boon for both medics and the public
Airships can patrol the upper atmosphere, monitoring the ground or peering at the stars for a fraction of a cost of satellites, according to a new report. All that’s needed is a prize to kick-start innovation.
Galileo could not have built the world’s first astronomical telescope without a revolutionary new theory of optics that he must have kept secret, argue historians of science
Astrophysicists believe that our galaxy must be filled with more dark matter than ordinary matter. Now astronomers say they can find no evidence of dark matter’s gravitational influence on the planets. What gives?
Researchers demonstrate an invisibility cloak that can be scaled to almost any size and say it could be used to hide orbiting satellites
The US Naval Surface Warfare Center has created an Android app that secretly records your environment and reconstructs it as a 3D virtual model for a malicious user to browse
Physicists have long known that entangled photons can make more precise measurements than independent ones. Now Japanese physicists have built a microscope that proves it.
There are now many general-purpose consumer LED bulbs that give off good light. With so many, how can you tell the difference?
Thanks to a leak of Syrian web censorship data, internet researchers have been able to analyse, for the first time, exactly what steps an authoritarian regime takes to restrict traffic.