8 Do You Know what causes the Bloom on Grapes?
9 Do You Know which is the most beautiful Building in the World?
32 Do You Know what Quinine is?
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33 Do You Know where a Railway runs over the Sea?
36 Do You Know why Shells vary in shape?
42
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45 Do You Know what causes a Volcanic Eruption?
48 Do You Know why Wood floats in water, and Iron sinks?
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