On 6/12/10 2:06, in article , "James"
wrote:

It's been pointed out that people do their best in their 20s and early
30s.


When I was a teenager I venture into Einstein's theory of relatively,
equations and all and thought I understood it. I went back couple
of years ago and the math escaped me. As a college student I
had the chance of discussing aspects of the theory with Feynman,
and he cleared up one error I had.

The problem is clocks moving slower as one velocity increases.
The dilemna is that velocity is relative, so the observer's clock
at rest would appear to run slower as viewed by the speeding
vehicle. I asked Feynman the solution and he explained
that the faster moving vehicle had accelerated to that speed.

The idea of energy converting o mass was specific in Einstein's
equations, but it was kinetic energy converting. I still find
photons confusing, no mass but they have momentum, both linear
and angular. If absorbed they become matter.

Anyway old age brings some reflections and loss of understanding.
I think I have a better integrated understanding of some things,
which I call wisdom. One's analytical abilities decrease, one's
synthetic abilities may improve.