Whenever you feel happy, you were not looking for it.
That is the first basic thing about happiness: it happened
when you were looking for something else. For example,
you have heard the story of
Archimedes: he was in
search of a scientific truth. He worked, experimented,
thought, pondered over it many days and nights. He
forgot himself. Then suddenly, when he was in his bath
one day, lying down in his tub, it happened, it bubbled up
– he realized. He was naked, but he forgot that he was
naked. When you are happy you forget yourself; if you
cannot forget yourself you are not happy. Happiness
means you are no longer there; it happens only when you
are not...

                                                         --Osho
                                        The Mustard Seed, ch. 12
Archimedes
c. 287-212 BCE
aka: Archimedes of Syracuse

Greek:
 Ἀρχιμήδης
Greek scientist, physicist, mathematician, astronomer, etc.

very well known in his time

killed by a Roman soldier in the Siege of Syracuse
the Archimedes Screw
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