Intros
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    1997 intro to the Bill Nye episode (#1715)
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    1996 intro to episode #1707
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    1996 intro to episode #1696
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    1995 intro to episode #1686
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    1995 intro to episode #1681
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    1994 intro to episode #1675
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    1994 intro to episode #1671
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    1993 intro to episode #1666
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    1993 intro to episode #1664
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    1992 intro to episode #1657
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    1992 intro to episode #1647
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    1991 intro to episode #1642