Identify the odd one out., Sun, Star, Bulb, Book, Identify the odd one out., Glass, Water, Butter paper, Air, Identify the odd one out., Air, Lens, Water, Wall, What is the speed of the light?, 3 × 10⁶ m/s, 3 × 10⁴ m/s, 300 m/s, 3 × 10⁸ m/s.

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