Three types of looming-selective neurons have been found in the nucleus rotundus of pigeons, each computing a different optical variable related to image expansion of objects approaching on a direct ...

Levitation isn't just for mystics anymore. A Japanese technology team has demonstrated ultrasonic levitation of objects that for the first time works in three dimensions. This means that as opposed to ...

Quantum theory and Einstein's theory of general relativity are two of the greatest successes in modern physics. Each works ...