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Methuselah Tree  
Illuminating Photosynthesis
Intro | The Cycle | Atomic Shuffle | Three Puzzlers: 1 | 2 | 3

Person under tree

Puzzler 1

A tree inhales carbon dioxide;
     it needs to if it's to survive.
But can it release enough O2
     to keep just one person alive?                             Yes | No




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Explore the Methuselah Grove | A Tree's Secret to Living Long
Build a Tree-Ring Timeline | Illuminating Photosynthesis
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