“It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so,” the US writer and humorist Mark Twain said.

What Twain taught us is that deeply rooted and firmly entrenched beliefs are difficult to change without the ability to think critically, and that when confronted by an opinion that contradicts our own, we tend to retreat more strongly into our entrenched beliefs...

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