Babies manipulate their moms for maximum smiles.

If you’re like most people, when a baby smiles at you, you smile back. If you’re these scientists, though, you carefully record the baby’s smiles in order to build a creepy baby-simulating robot (complete with a face that only a scientist could love — see figure below). In the process of building the robot, the authors of this study found that by 4 months, babies and their mothers fall into a predictable smiling routine: “mothers consistently attempted to maximize the time spent in mutual s

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