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![]() | To win a copy of Positivity: Groundbreaking Research to Release Your Inner Optimist and Thrive... |
| Simon Knight ★ (follow me) | Original Source | ![]() |
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Stage 2 of Piaget's stages (~2 min). Thanks to: http://teachinghighschoolpsychology.blogspot.com/2009/12/piaget-and-youtube.html |
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