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Hipervinculo Física
What optics are and different types, and how they work and form images.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Hipervinculo Historia
What happened in the first half of the last month of the year?
It is an educational content by JetPunk, site that contains a wide variety of quizzes.
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