The Sir Douglas Robb Lectures - University of Auckland 1979 with Richard Feynman. This video lecture series and his QED book were aimed at an educated public audience and don't require too much Mathematics.
The Videos:
Photons - Corpuscles of Light: http://goo.gl/SVR2p
Fits of Reflection and Transmission: http://goo.gl/soKYQ
Electrons and their Interactions: http://goo.gl/P08s1
New Queries: http://goo.gl/9lW5F
The Book:
QED:The Strange Theory of Light and Matter: http://goo.gl/WCd4e
This quote on what might be called the beauty of simplicity is a bit more Mathematical and is from Richard Feynman's 1965 Nobel Lecture.
I would like to interrupt here to make a remark. The fact that electrodynamics can be written in so many ways - the differential equations of Maxwell, various minimum principles with fields, minimum principles without fields, all different kinds of ways, was something I knew, but I have never understood. It always seems odd to me that the fundamental laws of physics, when discovered, can appear in so many different forms that are not apparently identical at first, but, with a little mathematical fiddling you can show the relationship. An example of that is the Schrödinger equation and the Heisenberg formulation of quantum mechanics. I don't know why this is - it remains a mystery, but it was something I learned from experience. There is always another way to say the same thing that doesn't look at all like the way you said it before. I don't know what the reason for this is. I think it is somehow a representation of the simplicity of nature. A thing like the inverse square law is just right to be represented by the solution of Poisson's equation, which, therefore, is a very different way to say the same thing that doesn't look at all like the way you said it before. I don't know what it means, that nature chooses these curious forms, but maybe that is a way of defining simplicity. Perhaps a thing is simple if you can describe it fully in several different ways without immediately knowing that you are describing the same thing.
More here: http://goo.gl/zx2E8
Ps thanks to A Tomé for pointing this
'via Blog this' The Honourable Schoolboy
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