Lord Bragg of Wigton has a big interest in Physics and has done a lot to promote the subject. Heisenberg was the subject of a recent In Our Time. Towards the end, a contributor describes starting out to draw a wave as a series of points. When you draw the first point, you know a lot about the position. But you need to add more points in order to figure out the wavelength. With more points, you know less about the position. Hence particle and wave properties cannot be fully known at once.
