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Miksi vuodenajat pysyvät paikoillaan vai pysyvätkö ne?

4.5
Average: 4.5 (2 votes)
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How can one observe the Earth’s rotation by sense perception?

4.5
Average: 4.5 (2 votes)
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Optical investigation made with a cell phone

3.5
Average: 3.5 (2 votes)
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Could a trained rat become an astronaut on a flight to Mars?

3.666665
Average: 3.7 (3 votes)
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Is Cosmic Radiation Dangerous?

4.333335
Average: 4.3 (3 votes)
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Astronomical perpetual machine

4
Average: 4 (3 votes)
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Rotta matkalla Marsiin

3.666665
Average: 3.7 (3 votes)
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Rotta astronauttina?

3
Average: 3 (2 votes)
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Kosmisen säteilyn vaarallisuus, toinen versio

3.666665
Average: 3.7 (3 votes)
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Kosmisen säteilyn vaarallisuus 3

3
Average: 3 (2 votes)
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