Who discovered Fractals?

The credit goes to Benoit Mandelbrot for discovering the fractals. He gave them the present name in 1975 though mathematicians have known about them as long as the 17th century…. Read more »

Who discovered Ultrasonic Sound?

It is believed generally that Paul Langevin of France was the first to discover ultrasonic sound, but there are others also who made significant contribution in its discovery. Langevin created… Read more »