Artificial intelligence has taken many forms over the years and is still evolving. Will machines soon surpass human knowledge ...

Most patterns eventually repeat themselves. But in the 1970s, mathematician Roger Penrose discovered a set of shapes that could cover an infinite plane without ever repeating. Known as Penrose tilings ...

What started as an investigation of the Virginia Parole Board’s controversial decision to release a man convicted of killing a Richmond police officer 40 years ago has morphed into a much broader ...