Physicist Lawrence Krauss says there’s a perfectly good reason so many theories in physics are hard to wrap our minds around: Our brains didn’t evolve for such heavy lifting.

Natural selection didn’t favor homo sapiens for our ability to ponder spooky action at a distance, he notes. It favored us because we learned how to get away from those big hungry predators. So relativity’s a bit of a stretch for us refugees from the savannah.

But that’s okay, says Krauss. In fact, it’s what makes science and physics so much fun.

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So don’t feel bad if understanding something new means just sitting and thinking about it for a little bit, and don’t feel bad you — we — don’t know more. Doing a puzzle’s much more enjoyable than having done one.

Plus also, there are no predators chasing us.