Part 1 - Richard Feynman Video - The Douglas Robb Memorial Lectures
Photons- Corpuscles of Light (beginning discussion of photons & their properties)

Total time: 78:20

3:04 light & electomagnetism, describes spectrum

5:12 structure of atoms

6:56 Chemistry/physics "joke"

12:35 measurement example

14:08 "distance from me to the moon"/accuracy

15:20 checkers example to describe idea of rules being simple but things nonetheless are complicated (because of the scale)

21:00 talks about "understanding" a theory

26:16 "don't worry, no one understands..."

26:54 Mayan indians prediction of Venus' movement example

31:50 "the more accurately they can do it adds nothing to their understanding..." (Mayan example still continued)

33:53 doesn't matter which theories...the facts are what matters. modern science merely describes the situation.

35:07 the properties of light

	-newton discovered light is made of all colors
	-newton believed light was corpuscular (like raindrops)
	-particles of light (37:04)
	
38:09 light/voltage experiment described

40:51 reflection

43:01 reflection phenomenon is probabilistic 

	-but will the light go up or down? 
	-can't tell, it's chance

47:00 it's chance...

49:32 second feature of light: example: colors in soap bubbles, oil colors in puddle. both produced by reflections from 2 surfaces

	-if using monochromatic light you get bands, not color (51:39)

52:07 outlines newton's experiment (draws diagram on board)

54:04 reflection coefficient

57:20 calculates probability that light counter goes off (area of circle based on arrow of reflection; draws on board)

	-turn arrow, reflection angle depends on time

64:00 begins to describe what he will do in next lecture

64:38 for every event you calculate an amplitude...
	-if thing can happen in more than one way, draw all arrows to get total amplitude

67:06 this one rule calculates the probability for everything... (circle of the amplitude, square of the amplitude -67:40)
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questions & answers following lecture...

68:20 question: "These rotating arrows are all very well--but is there another model?" 
	no one can find one but... Newton doesn't bother to explain gravity, he just uses it.

70:04 question: "Do you like the idea that our picture of the world has to be based on on a calculation which involves probability?" 
	not really...I never think 'like' or 'don't like,' just that 'this is what it is.' ...like or don't like is irrelevant...It's not personal.

71:12 question: "Have you left out  anything in this lecture which you need to add later?" 
	later on I need to change the examples a little (talks more about the reflection diagram on the board)

74:08 question: "Does your picture apply to anything besides electrons and light?" 
	this aspect is universal as far as we can tell. the next problem is how to draw arrows under different circumstances. electrons and light 	we know the rules. protons we don't know. 

75:19 question: "When you are looking at something do you see only light or do you see the object?"  
	...says this is a dopey philosophical question and gives an excellent example of someone eating a steak...

76:10 question: "Can you tell us whether in the future your theory will be found to be wrong- or is it complete?" 	how can we know what's final? all I can tell you is what we know today...not tomorrow. I don't know the future....