Why are tubes called "valves" but transistors aren't?

There's only one kind of physics (that works).
Although the universe must behave according to logic, we don't know which logic.
So any conjecture, found by any method, can be entertained, and undergo confirmation or refutation.
 
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Thomas Kuhn... Ludwig Wittgenstein

Should be required reading for anyone learning/practicing Science and anyone who wants to understand/discuss Science.

I also got a little book about "Ancient Science"... it's really neat. Talks about how the ancients viewed Science and their methods.
 
Torch comes from one of those fires on a stick.
As used to light the Olympic flame or light Indiana Jones through the cave full of snakes.
The forerunner of the battery / LED device we know and love today.
It always causes me laugh when I hear in a film dubbed to Hungarian; "turn on the torch" translated to "fáklya" which is the burning stick once used in ancient castles, the olympic flame, etc.