Well, you could tackle new questions (new to you) for which there is an objective answer.
For example, there is no bullshit in mathematics. In this subject, it is quite feasible for a cute little first-year student of eighteen to argue with a white-bearded professor and to prove him wrong, because he was. There's no "wiggle room".
Of course, this way of exercising objectivity relies on you having someone around who will explain the correct answer to you; and of you having the wit to realize that you were wrong.
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