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The Natural Philosopher

David Hansen wrote:
On 27 Jan 2008 18:00:37 GMT someone who may be
(Andrew Gabriel) wrote this:-

It is a common claim, but still an incorrect one. It may have been
true in the 1970s, but that was a long time ago and engineering has
moved on since then.
Not much. In spite of much research, their efficiency has
only doubled in the ~50 years since they were invented,

One also needs to consider the energy involved in manufacture.

Indeed. So why don't you?