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ppk ppk
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13 years ago
Explain how the Doppler Effect has been used to detect invisible planets orbiting other Sun-like stars. 
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how_mendelhow_mendel
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13 years ago
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Biology!

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13 years ago
Just got PERFECT on my quiz
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Thank you, thank you, thank you!
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2 hours ago
This calls for a celebration Person Raising Both Hands in Celebration
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