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Based on Barry Newell's book, Turtle Confusion, this activity presents 40 shape challenges to the learner that must be completed using basic Logo-blocks. Turtle Confusion is a fork of Turtle Blocks.
A simple puzzle where by you have to flip coins until they are all heads up.
This activity displays a map of the sky showing the position of the visible stars, some of the larger and brighter deep-sky objects (DSOs), the "classical" planets, the sun and the moon.