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Motifs
- Absurd scientific theories – general. J2260
- Absurd astronomical theories. J2270
- Absurd theories concerning the moon. J2271
- Absurd theories concerning the sun. J2272
- Absurd theories concerning the sky. J2273
- Absurd theories about the earth. J2274
- Absurd theories about the stars. J2275
- Absurd theories concerning time. J2276
- Absurd theories about clouds. J2277
- Other absurd scientific theories. J2280