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Find
out why Galileo's observations of sunspots in the
17th century were so controversial. Visit the Galileo
Debate. |
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Related
to chapter 1 of the print guide. |
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Scientists
use the same techniques as detectives to solve
mysteries. |
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Related
to chapter 1 of the print guide. |
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Find
out why it is so unusual to see
the Northern Lights as far south as Tucson,
Arizona. |
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Related
to chapter 1 of the print guide. |
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