6 Do You Know what causes the Bedeguar of the Wild Rose?
8 Do You Know what causes the Bloom on Grapes?
9 Do You Know which is the most beautiful Building in the World?
10 Do You Know where the Oldest Buildings in the World are?
22 Do You Know why a Golf Ball is not Smooth?
23 Do You Know how a Gramophone acts?
25 Do You Know what India-rubber is?
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32 Do You Know what Quinine is?
33 Do You Know where a Railway runs over the Sea?
35 Do You Know why a Saw has a Notch in its top edge?
36 Do You Know why Shells vary in shape?
41 Do You Know why Stone Steps were placed by the road-side?
42 Do You Know why the Sun makes us Brown?
43 Do You Know what a Tidal Wave is?
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44 Do You Know which is the Biggest Tree in the World?
45 Do You Know what causes a Volcanic Eruption?
46 Do You Know what causes the Waves, and why the Sea is salt?
47 Do You Know what causes the Wind?
48 Do You Know why Wood floats in water, and Iron sinks?
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