Cecil Moore wrote:
Michael wrote:

From my son's perspective, a teacher must really know something to be a

teacher. Sadly, this is far from true.

When I was student-teaching in the early 60's, the regular
physics teacher told his students that transistors were
made out of geranium. :-)

Everybody knows they are made out of humurous ex-convicts [silly-con].

But, in the 60s I was production engineer making 'geranium' transistors.