RIO DE JANEIRO (AP) — Four people died on Monday after a fire at a shelter for the homeless in a city in southeastern Brazil, Sao Paulo’s secretariat for public security said. A 42-year-old man was ...

(THE CONVERSATION) To a nonmathematician, having the letter “i” represent a number that does not quite exist and is “imaginary” can be hard to wrap your head around. If you open your mind to this way ...