A 'single-photon server', producing a steady stream of single-photon pulses for up to half a minute, has been created by confining, cooling and controlling a neutral atom inside a tiny optical cavity.

Normally, if you change a file’s extension in Windows, it doesn’t do anything positive. It just makes the file open in the wrong programs that can’t decode what’s inside. However, [PortalRunner] has ...

https://www.pcworld.com/downloads/file/fid,45938/description.html offers a simple, free way to encrypt individual files. Right-click a file, a few files, or a folder ...