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This is Scientific American 60-Second Mind, I'm Christie Nicholson. Got a minute?

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Living things are filled with…stuff. We know this.

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But at what age did we start knowing this?

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Well, a study says it could be hardwired into our brains.

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Because infants seem to know that animals ought to have gushy insides, and not be hollow.

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The research is in the Proceedings of the National Academy of Sciences.

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When babies see something unusual they turn to look at it longer than when they see they expected.

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The researchers presented toys to 8-month olds that appeared to move on their own and also have an intention to move.

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And they also showed the babies toys that could only do one of those things, and toys that could do neither.

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The researchers then opened up the objects, all of which were hollow.

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And the babies stared longer at the hollow objects that had appeared to move on their own with intention than they did at the other toys.

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So it appears that these hollow toys defied the babies' expectations, as if they were thinking:

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There really should be something in there.

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Which means babies make the mental link between intentional movement and the requirement for insides.

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They already know that this life takes guts.

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Thanks for the minute, for Scientific American 60-Second Mind. I'm Christie Nicholson.

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