It's hard to believe that something which is neither seen nor
felt can do so much harm.
That's true. But an idea can't be seen or felt. And that's
what kept the Troglytes in the mines all these centuries. A
mistaken idea.
-- Vanna and Kirk, "The Cloud Minders," stardate 5819.0
So Richard and I decided to try to catch [the small shark].
With a great deal of strategy and effort and shouting, we managed to
maneuver the shark, over the course of about a half-hour, to a sort of
corner of the lagoon, so that it had no way to escape other than to
flop up onto the land and evolve....