jueves, 16 de abril de 2015

Electrons


4 comentarios:

  1. this videos are very dificult

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  2. I am Pedro 5a.
    It is nice but is a little bit difficult to understand it.
    Vídeos of eureka are great.

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  3. It´s nice but i can´t understand

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  4. It is very funl. I am teresa

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