Walther Klemm was a German painter, graphic artist, and illustrator. Best known for his monochromatic woodblock prints of animals, his work retains an illustrative, documentary quality, often ...

Tracking time is one of those things that seems easy, until you really start to get into the details of what time actually is. We define a second as 9,192,631,770 oscillations of a cesium atom.

You may be among the 45% of adults who snore at least occasionally or you likely know someone who does. They may be the brunt of jokes ("Uncle Joe snores so loudly he rattles the windows!"), but ...

Astronomers have detected a flare from a black hole that is unlike any we’ve ever seen. This remarkable event originated from the supermassive black hole at the heart of the Active Galactic Nucleus ...

Abstract: The X-ray pulsar-based navigation (XNAV) is a feasible navigation method, which provides position information of the spacecraft. However, according to the theory of relativity, the time ...

Abstract: This article presents a novel convolutional neural network (CNN) architecture for segmenting significantly small and crowded objects in remote sensing imagery. Although such small objects ...

Background Intracranial atherosclerotic disease (ICAD) significantly contributes to ischemic stroke, especially among Asian populations. Large vessel occlusion (LVO) due to underlying ICAD accounts ...

Objective The use of minimally invasive endoluminal treatment for urethral strictures has been a subject for debate for several decades. The aim of this study was to review and discuss the safety, ...