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HQ49 100,000 Whys Series ~ Happy Dragon: Why are grape vines able to climb? 9789672418870
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HQ46 100,000 Whys Series ~ Happy Dragon: Why are monkeys able to eat fast? 9789672418689
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HQ45 100,000 Whys Series ~ Happy Dragon: Why should we not eat too much fast food? 9789672418580
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HQ44 100,000 Whys Series ~ Happy Dragon: Why do firecrackers produce loud noises? 9789672418542
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HQ43 100,000 Whys Series ~ Happy Dragon: Why do tanks have caterpillar tracks? 9789672418528
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HQ42 100,000 Whys Series ~ Happy Dragon: Why do electric rays produce electricity? 9789672418450
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HQ41 100,000 Whys Series ~ Happy Dragon: Why are there craters on the Moon? 9789672418443
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