Unknowns everywhere, living with uncertainty

The Talmud says: “Accustom your tongue to say, I do not know.” (Maimonides said something similar: “Teach your tongue to say, I do not know.”)

That's the theory. On the creek:

• A hawk, unlike the red-tails, flies over the campus, over a roofline. But I can see only the shadow of a flying raptor.

• Something — I think a large turtle — slips off a log. I see only the splash.

• A raptor — it looked twice the size of a kestrel, but with a light chest and blue back — was flying up the creek.

• A strike a calm lake — bass, carp or gar?

I looked. I saw. I do not know what I saw. If that drives you crazy, better not walk.