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/sci/ - Science & Math

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>> No.15977431 [View]
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>>15977429

>> No.15446203 [View]
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>> No.14631731 [View]
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>> No.12621941 [View]
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Here is another dumb question.

How do we determine that stuff like uranium has a halflife of billions of years?

>> No.12576565 [View]
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>> No.12404746 [View]
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