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It seems that in the Code: LYOKO universe, kids have really big heads compared to the rest of their bodies. The adults, unlike the kids, have normal heads. This will come to the assumption that the characters' heads start out big and do not grow at all. Instead, they shrink. Take a look at Jeremie, for example, then look at Mr. Delmas. If you've seen them together, you can easily identify that Mr. Delmas has a smaller head. This may allow for more facial movement recognition on the kids' part, but it is unreal and very annoying to the scientists among us.